9-substituted 8-oxoadenine compound

ABSTRACT

The present invention provides an 8-oxoadenine compound having immunomodulating activities such as an interferon inducing activity and useful as an antiviral agent and antiallergic agent, which is represented by the following formula (1): 
                         
[wherein the ring A represents a 6-10 membered aromatic carbocyclic ring and the like, R represents a halogen atom, an alkyl group and the like, n represents an integer of 0-2, Z 1  represents alkylene, X 2  represents oxygen atom, sulfur atom, SO 2 , NR 5 , CO, CONR 5 , NR 5 CO and the like, Y 1 , Y 2  and Y 3  represent independently a single bond or an alkylene group, X 1  represents oxygen atom, sulfur atom, NR 4  (R 4  is hydrogen atom or an alkyl group) or a single bond, R 2  represents a substituted or unsubstituted alkyl group, R 1  represents hydrogen atom, hydroxy group, an alkoxy group, an alkoxycarbonyl group or a haloalkyl group]
 
or its pharmaceutically acceptable salt.

This application is a continuation of U.S. application Ser. No. 13/187,260, filed on Jul. 20, 2011, now U.S. Pat. No. 8,575,180, which is a continuation of U.S. application Ser. No. 10/593,691, filed on Dec. 4, 2006, now U.S. Pat. No. 8,012,964, which is the National Stage under 35 USC §371 of International Application Number PCT/JP2005/005401, filed on Mar. 24, 2005, which claims priority under 35 USC §119 (a)-(d) of Application No. 2004-093672, filed in Japan on Mar. 26, 2004.

JOINT RESEARCH AGREEMENT

The subject matter claimed in this application was made as a result of activities undertaken within the scope of a joint research agreement dated Dec. 19, 2003 between AstraZeneca AB and Sumitomo Pharmaceuticals Co., Ltd. All of the rights and obligations of Sumitomo Pharmaceuticals Co., Ltd. as defined in the joint research agreement between AstraZeneca AB and Sumitomo Pharmaceuticals Co., Ltd. were assumed by Dainippon Sumitomo Pharma Co., Ltd., a company created by the merger of Dainippon Pharmaceuticals Co., Ltd. and Sumitomo Pharmaceuticals Co., Ltd. effective Oct. 3, 2005. Dainippon Sumitomo Pharma Co., Ltd., has changed its name to Sumitomo Dainippon Pharma Co., Ltd.

TECHNICAL FIELD

The present invention relates to a novel adenine compound useful as a prophylactic or therapeutic agent for viral diseases, allergic diseases, etc.

BACKGROUND ART

Interferon is an endogenous protein having an important role in an immune system in mammals, and not only takes a partial role in a nonspecific defense mechanism in a living body but also strongly participates in a specific defense mechanism thereof. Actually, interferon has been used as an agent for treating viral diseases such as hepatitis B and hepatitis C in a clinical field. A low molecular weight organic compound (an interferon-inducing agent) which induces a biosynthesis of the said interferon has been developed as the next generation interferon therapy, including an imidazoquinoline derivative (refer to the patent document 1) and an adenine derivative (refer to the patent documents 2 and 3), and an imidazoquinoline derivative, Imiquimod has been used as an external antiviral agent for genital wart in a clinical field.

On the other hand, T-cell taking a central role in an immune response in a living body is classified into two groups, Th1-cell and Th2-cell, and in a living body of a patient suffering from an allergic disease, an excess amount of cytokines such as interleukin-4 (IL-4) and interleukin-5 (IL-5) is excreted from Th-2 cell, and thus a compound suppressing an immune response of Th2 cell can be expected as an agent for treating allergic diseases.

The above imidazoquinoline derivative and adenine derivative have been known as showing a suppressing activity of production of interleukin-4 (IL-4) and interleukin-5 (IL-5) as well as an inducing activity of interferon, and have been actually known to be effective to an allergic disease also in a model animal.

However, there is such a fear that systemic adverse effects based on the interferon inducing activity would be problem upon using such derivatives as an anti-allergic agent.

-   [Patent Document 1] U.S. Pat. No. 4,689,338 -   [Patent Document 2] WO 98/01448 -   [Patent Document 3] WO 99/28321

DISCLOSURE OF INVENTION

The problem to be solved by the present invention is to provide a novel 8-oxoadenine compound useful as an immuno-modulator and a therapeutic or prophylactic agent for allergic diseases, viral diseases and cancers comprising the said compound as an effective ingredient.

The present inventors have made extensive study for obtaining an immuno-modulator useful as a therapeutic or a prophylactic agent for allergic diseases such as asthma, viral diseases and cancers to find the 8-oxoadenine compound of the present invention. Namely, the compound of the present invention is an immuno-modulator having an immunoactivation effect such as an interferon inducing activity and also having a suppressing activity of production of a cytokine such as IL-4 and IL-5 originated from Th2-cell, and thus is effective as a therapeutic or prophylactic agent for allergic diseases, viral diseases and cancers.

The prevent invention has been completed on the basis of the above finding.

BEST MODE FOR CARRYING OUT THE INVENTION

Namely, the present invention is as follows:

-   [1] An 8-oxoadenine compound shown by the formula (1):

wherein ring A represents a 6-10 membered aromatic carbocyclic ring or a 5-10 membered heteroaromatic ring;

-   R represents a halogen atom, an alkyl group, a hydroxyalkyl group, a     haloalkyl group, an alkoxy group, a hydroxyalkoxy group, a     haloalkoxy group, amino group, an alkylamino group, a dialkylamino     group, or a cyclic amino group; -   n represents an integer of 0-2, and when n is 2, the Rs may be the     same or different; -   Z¹ represents a substituted or unsubstituted alkylene group or a     substituted or unsubstituted cycloalkylene group; -   X² represents oxygen atom, sulfur atom, SO₂, NR⁵, CO, CONR⁵, NR⁵CO,     SO₂NR⁵, NR⁵SO₂, NR⁵CONR⁶ or NR⁵CSNR⁶ (in which R⁵ and R⁶ are each     independently hydrogen atom, a substituted or unsubstituted alkyl     group, or a substituted or unsubstituted cycloalkyl group.); -   Y¹, Y² and Y³ represent each independently a single bond or an     alkylene group; -   X¹ represents oxygen atom, sulfur atom, SO₂, NR⁴ (wherein R⁴ is     hydrogen atom or an alkyl group) or a single bond; -   R² represents hydrogen atom, a substituted or unsubstituted alkyl     group, a substituted or unsubstituted alkenyl group, a substituted     or unsubstituted alkynyl group or a substituted or unsubstituted     cycloalkyl group; and -   R¹ represents hydrogen atom, hydroxy group, an alkoxy group, an     alkoxycarbonyl group, a haloalkyl group, a haloalkoxy group, a     substituted or unsubstituted aryl group, a substituted or     unsubstituted heteroaryl group or a substituted or unsubstituted     cycloalkyl group, -   or its pharmaceutically acceptable salt. -   [2] The 8-oxoadenine compound as described in the above [1], wherein -   ring A represents a 6-10 membered aromatic carbocyclic ring, or a     5-10 membered heteroaromatic ring containing 1-4 hetero atoms     selected from 0-4 nitrogen atoms, 0-2 oxygen atoms and 0-2 sulfur     atoms; -   R represents a halogen atom, an alkyl group of 1-6 carbons, a     hydroxyalkyl group of 1-6 carbon, a haloalkyl group of 1-6 carbons,     an alkoxy group of 1-6 carbons, a hydroxyalkoxy group of 1-6     carbons, a haloalkoxy group of 1-6 carbons, amino group, an     alkylamino group of 1-6 carbons, a dialkylamino group in which each     alkyl moiety has 1-6 carbons, and a cyclic amino group, n is an     integer of 0-2, and when n is 2, Rs may be the same or different; -   Z¹ represents an alkylene group of 1-6 carbons or a cycloalkylene     group of 3-8 carbons, which is optionally substituted by hydroxy     group; -   X² represents oxygen atom, sulfur atom, SO₂, NR⁵, CO, CONR⁵, NR⁵CO,     SO₂NR⁵, NR⁵SO₂, NR⁵CONR⁶ or NR⁵CSNR⁶ (in which R⁵ and R⁶ are     independently hydrogen atom, a substituted or unsubstituted alkyl     group of 1-6 carbons and a substituted or unsubstituted cycloalkyl     group of 3-8 carbons, wherein the substituents of the alkyl group or     cycloalkyl group are selected from a halogen atom, hydroxy group, an     alkoxy group of 1-6 carbons, carboxy group, an alkoxycarbonyl group     of 2-5 carbons, carbamoyl group, amino group, an alkylamino group of     1-6 carbons, a dialkylamino group in which each alkyl moiety has 1-6     carbons, a cyclic amino group, carboxy group and tetrazolyl group     which may be substituted by an alkyl group of 1-6 carbons.); -   Y¹, Y² and Y³ represent independently a single bond or an alkylene     group of 1-6 carbons; -   X¹ represents oxygen atom, sulfur atom, SO₂, NR⁴ (wherein R⁴     represents hydrogen atom or an alkyl group), or a single bond; -   R² represents a substituted or unsubstituted alkyl group of 1-6     carbons, a substituted or unsubstituted alkenyl group of 2-6     carbons, a substituted or unsubstituted alkynyl group of 2-6 carbons     or a substituted or unsubstituted cycloalkyl group of 3-8 carbons     (wherein the substituent in the alkyl group, the alkenyl group and     the alkynyl group is selected from a halogen atom, hydroxy group, an     alkoxy group of 1-6 carbons, an acyloxy group of 2-10 carbons, amino     group, an alkylamino group of 1-6 carbons and a dialkylamino group     in which each alkyl moiety has 1-6 carbons, and a cyclic amino     group.); -   R¹ represents hydrogen atom, hydroxy group, an alkoxy group of 1-6     carbons, an alkoxycarbonyl group of 2-5 carbons, a haloalkyl group     of 1-6 carbons, a haloalkoxy group of 1-6 carbons, a substituted or     unsubstituted aryl group of 6-10 carbons, a substituted or     unsubstituted 5-10 membered heteroaryl group containing 1-4 hetero     atoms selected from 0-4 nitrogen atoms, 0-2 oxygen atoms or 0-2     sulfur atoms or a substituted or unsubstituted cycloalkyl group of     3-8 carbons, and -   the said substituent in the aryl group, the heteroaryl group and the     cycloalkyl group is selected from a halogen atom, hydroxy group, an     alkyl group of 1-6 carbons, a haloalkyl group of 1-6 carbons, an     alkoxy group of 1-6 carbons, a haloalkoxy group of 1-6 carbons, an     alkylcarbonyl group of 2-5 carbons, amino group, an alkylamino group     of 1-6 carbons and a dialkylamino group in which each alkyl moiety     has 1-6 carbons, -   and the said cyclic amino group means a 4-7 membered saturated     cyclic amino group containing 1-2 hetero atoms selected from 1-2     nitrogen atoms, 0-1 oxygen atom and 0-1 sulfur atom, which may be     substituted with a halogen atom, hydroxy group, oxo group, an alkyl     group of 1-6 carbons, an alkoxy group of 1-6 carbons, an     alkylcarbonyl group of 2-5 carbons or an alkoxycarbonyl group of 2-5     carbons, in the formula (1), -   or its pharmaceutically acceptable salt. -   [3] The 8-oxoadenine compound or its pharmaceutically acceptable     salt as described in the above of the above [1] or [2], wherein X²     in the formula (1) is oxygen atom, sulfur atom, NR⁵, SO₂, NR⁵SO₂ or     NR⁵CONR⁶. -   [4] The 8-oxoadenine compound or its pharmaceutically acceptable     salt as described in any of the above [1] to [3], wherein Y³ in the     formula (1) is a single bond, methylene or ethylene. -   [5] The 8-oxoadenine compound or its pharmaceutically acceptable     salt as described in any of the above [1] to [4], wherein Z¹ in the     formula (1) is a straight chained alkylene group of 1-6 carbons     which may be substituted with hydroxy group. -   [6] The 8-oxoadenine compound or its pharmaceutically acceptable     salt as described in any of the above [1]-[5], wherein X¹ in the     formula (1) is oxygen atom or sulfur atom. -   [7] The 8-oxoadenine compound or its pharmaceutically acceptable     salt as described in any of the above [1]-[6], wherein Y¹ in the     formula (1) is a single bond or an alkylene group of 1-6 carbons. -   [8] The 8-oxoadenine compound or its pharmaceutically acceptable     salt as described in any of the above [1]-[7], wherein R¹ in the     formula (1) is hydrogen atom, an alkoxycarbonyl group, hydroxy     group, or an alkoxy group. -   [9] The 8-oxoadenine compound or its pharmaceutically acceptable     salt as described in any of the above [1]-[8], wherein a group shown     by the formula (2) in the formula (1):

wherein ring A, R, n, Y³ and R² have the same meaning as in the formula (1), is a group shown by the formula (3) or the formula (4):

wherein R, n and R² have the same meaning as in the formula (1), and R³ is hydrogen atom or an alkyl group.

-   [10] The 8-oxoadenine compound or its pharmaceutically acceptable     salt as described in the above [9], wherein R² is methyl group or an     alkyl group of 2-6 carbons substituted by a dialkylamino group or a     cyclic amino group. -   [11] The 8-oxoadenine compound or its pharmaceutically acceptable     salt as described in the above [9] or [10], wherein R³ is hydrogen     atom. -   [12] A pharmaceutical composition, comprising the 8-oxoadenine     compound or its pharmaceutically acceptable salt described in any of     the above [1]-[11] as an active ingredient. -   [13] An immuno-modulator, comprising the 8-oxoadenine compound or     its pharmaceutically acceptable salt described in any of the above     [1]-[11] as an active ingredient. -   [14] A therapeutic or prophylactic agent for viral diseases, cancers     or allergic diseases, comprising the 8-oxoadenine compound or its     pharmaceutically acceptable salt described in any of the above     [1]-[11] as an active ingredient. -   [15] A medicament for topical administration, comprising the     8-oxoadenine compound or its pharmaceutically acceptable salt     described in any of the above [1]-[11] as an active ingredient. -   [16] A use of the 8-oxoadenine compound or its pharmaceutically     acceptable salt described in any of the above [1]-[11] as a     medicament. -   [17] A use of the 8-oxoadenine compound or its pharmaceutically     acceptable salt described in any of the above [1]-[11] for     manufacturing an immuno-modulator. -   [18] A use of the 8-oxoadenine compound or its pharmaceutically     acceptable salt described in any of the above [1]-[11] for     manufacturing a therapeutic or prophylactic agent for viral     diseases, cancers and allergic diseases. -   [19] A method for modulating immune response which comprises     administering to a patient, an effective amount of the 8-oxoadenine     compound or its pharmaceutically acceptable salt described in any of     the above [1]-[11]. -   [20] A method for treating or preventing viral diseases, cancers and     allergic diseases which comprises administering to a patient, an     effective amount of the 8-oxoadenine compound or its     pharmaceutically acceptable salt described in any of the above     [1]-[11]. -   [21] A process for preparing the 8-oxoadenine compound as described     in any of the above [1]-[11] which comprises brominating a compound     shown by the formula (10):

wherein ring A, n, R, R¹, R², X¹, X², Y¹, Y², Y³ and Z¹ are the same defined in the above [1],

-   reacting the resultant with a metal alkoxide and then hydrolyzing,     or hydrolyzing the resultant. -   [22] A compound shown by the formula (10):

wherein ring A, n, R, R¹, R², X¹, X², Y¹, Y², Y³ and Z¹ are the same defined in the above [1].

-   [23] A process for preparing an 8-oxoadenine compound as described     in any of the above [1]-[11] which comprises deprotecting a compound     shown by the formula (11):

wherein ring A, n, R, R¹, R², X¹, X², Y¹, Y², Y³ and Z¹ are the same defined in the above [1].

-   [24] A compound shown by the formula (11):

wherein Ring A, n, R, R¹, R², X¹, X², Y¹, Y², Y³ and Z¹ are the same defined in the above [1].

-   [25] A compound or a pharmaceutically acceptable salt thereof     selected from the group consisting of the following compounds: -   2-Butoxy-8-oxo-9-[2-(3-methoxycarbonylphenoxy)ethyl]adenine, -   2-Butoxy-8-oxo-9-[2-(3-methoxycarbonylmethylphenoxy)ethyl]adenine, -   2-Butoxy-8-oxo-9-[2-(2-methoxycarbonylphenoxy)ethyl]adenine, -   2-Butoxy-8-oxo-9-[2-(2-methoxycarbonylmethylphenoxy)ethyl]adenine, -   2-Butoxy-8-oxo-9-[2-(4-methoxycarbonylphenoxy)ethyl]adenine, -   2-Butoxy-8-oxo-9-[2-(4-methoxycarbonylmethylphenoxy)ethyl]adenine, -   2-Butoxy-8-oxo-9-{2-[4-(2-methoxycarbonylethyl)phenoxy]ethyl}adenine, -   2-Butoxy-8-oxo-9-[4-(3-methoxycarbonylbenzenesulfonamide)butyl]adenine, -   2-Butoxy-8-oxo-9-[4-(3-methoxycarbonylmethylbenzenesulfonamide)butyl]adenine, -   2-Butoxy-8-oxo-9-[4-(3-methoxycarbonylphenylaminocarbonylamino)butyl]adenine, -   2-Butoxy-8-oxo-9-[4-(3-methoxycarbonylmethylphenylaminocarbonylamino)-butyl]adenine, -   Methyl     [3-({[2-(6-amino-2-butoxy-8-oxo-7,8-dihydro-9H-purin-9-yl)ethyl]amino}methyl)phenyl]acetate, -   [3-({[2-(6-Amino-2-butoxy-8-oxo-7,8-dihydro-9H-purin-9-yl)ethyl]amino}methyl)phenyl]acetic     acid, -   Methyl     3-({[3-(6-amino-2-butoxy-8-oxo-7,8-dihydro-9H-purin-9-yl)propyl]amino}methyl)benzoate, -   3-({[3-(6-Amino-2-butoxy-8-oxo-7,8-dihydro-9H-purin-9-yl)propyl]amino}methyl)benzoic     acid, -   Methyl     4-({[3-(6-amino-2-butoxy-8-oxo-7,8-dihydro-9H-purin-9-yl)propyl]amino}methyl)benzoate, -   4-({[3-(6-Amino-2-butoxy-8-oxo-7,8-dihydro-9H-purin-9-yl)propyl]amino}methyl)benzoic     acid, -   Methyl     (3-{[[3-(6-amino-2-butoxy-8-oxo-9H-purin-9-yl)propyl](2-morpholin-4-ylethyl)amino]methyl}phenyl)acetate, -   Methyl     [3-({[4-(6-amino-2-butoxy-8-oxo-7,8-dihydro-9H-purin-9-yl)butyl]amino}methyl)phenyl]acetate, -   Ethyl     2-[2-(6-amino-2-butoxy-8-oxo-7,8-dihydro-9H-purin-9-yl)ethoxy]benzoate, -   3-(Dimethylamino)propyl     2-[2-(6-amino-2-butoxy-8-oxo-7,8-dihydro-9H-purin-9-yl)ethoxy]benzoate, -   Methyl     3-[4-({[4-(6-amino-2-butoxy-8-oxo-7,8-dihydro-9H-purin-9-yl)butyl]amino}sulfonyl)phenyl]propanoate, -   3-[4-({[4-(6-Amino-2-butoxy-8-oxo-7,8-dihydro-9H-purin-9-yl)butyl]amino}sulfonyl)phenyl]propanoic     acid, -   Methyl     (3-{[[4-(6-amino-2-butoxy-8-oxo-7,8-dihydro-9H-purin-9-yl)butyl](2-pyrrolidin-1-ylethyl)amino]sulfonyl}phenyl)acetate, -   (3-{[[4-(6-Amino-2-butoxy-8-oxo-7,8-dihydro-9H-purin-9-yl)butyl](2-pyrrolidin-1-ylethyl)amino]sulfonyl}phenyl)acetic     acid, -   Methyl     (3-{[[4-(6-amino-2-butoxy-8-oxo-7,8-dihydro-9H-purin-9-yl)butyl]     (2-methoxyethyl)amino]sulfonyl}phenyl)acetate, -   (3-{[[4-(6-Amino-2-butoxy-8-oxo-7,8-dihydro-9H-purin-9-yl)butyl](2-methoxy-ethyl)amino]sulfonyl}phenyl)acetic     acid, -   Methyl     (3-{[[4-(6-amino-2-butoxy-8-oxo-7,8-dihydro-9H-purin-9-yl)butyl](methyl)amino]sulfonyl}phenyl)acetate -   (3-{[[4-(6-Amino-2-butoxy-8-oxo-7,8-dihydro-9H-purin-9-yl)butyl](methyl)amino]sulfonyl}phenyl)acetic     acid, -   Methyl     [3-({[4-(6-amino-2-butoxy-8-oxo-7,8-dihydro-9H-purin-9-yl)butyl][3-(dimethylamino)-2,2-dimethylpropyl]amino}sulfonyl)phenyl]acetate, -   [3-({[4-(6-Amino-2-butoxy-8-oxo-7,8-dihydro-9H-purin-9-yl)butyl][3-(dimethylamino)-2,2-dimethylpropyl]amino}sulfonyl)phenyl]acetic     acid, -   Methyl     [3-({[3-(6-amino-2-butoxy-8-oxo-7,8-dihydro-9H-purin-9-yl)propyl]amino}sulfonyl)phenyl]acetate, -   Methyl     (3-{[[4-(6-amino-2-butoxy-8-oxo-7,8-dihydro-9H-purin-9-yl)butyl](2-hydroxy-2-methylpropyl)amino]sulfonyl}phenyl)acetate, -   (3-{[[4-(6-Amino-2-butoxy-8-oxo-7,8-dihydro-9H-purin-9-yl)butyl](2-hydroxy-2-methylpropyl)amino]sulfonyl}phenyl)acetic     acid, -   Methyl     [3-({[2-(6-amino-2-butoxy-8-oxo-7,8-dihydro-9H-purin-9-yl)ethyl]amino}sulfonyl)phenyl]acetate, -   Methyl     [3-({[4-(6-amino-2-butoxy-8-oxo-7,8-dihydro-9H-purin-9-yl)butyl][(2R)-2,3-dihydroxypropyl]amino}sulfonyl)phenyl]acetate, -   [3-({[4-(6-Amino-2-butoxy-8-oxo-7,8-dihydro-9H-purin-9-yl)butyl][(2R)-2,3-dihydroxypropyl]amino}sulfonyl)phenyl]acetic     acid, -   Methyl     3-({[4-(6-amino-2-butoxy-8-oxo-7,8-dihydro-9H-purin-9-yl)butyl][3-(dimethylamino)-2,2-dimethylpropyl]amino}sulfonyl)benzoate, -   3-({[4-(6-Amino-2-butoxy-8-oxo-7,8-dihydro-9H-purin-9-yl)butyl][3-(dimethyl-amino)-2,2-dimethylpropyl]amino}sulfonyl)benzoic     acid, -   Methyl     (3-{[[4-(6-amino-2-butoxy-8-oxo-7,8-dihydro-9H-purin-9-yl)butyl](3-morpholin-4-ylpropyl)amino]methyl}phenyl)acetate, -   (3-{[[4-(6-Amino-2-butoxy-8-oxo-7,8-dihydro-9H-purin-9-yl)butyl](3-morpholin-4-ylpropyl)amino]methyl}phenyl)acetic     acid, -   Methyl     [3-({[4-(6-amino-2-butoxy-8-oxo-7,8-dihydro-9H-purin-9-yl)butyl][3-(dimethylamino)-2,2-dimethylpropyl]amino}methyl)phenyl]acetate, -   [3-({[4-(6-Amino-2-butoxy-8-oxo-7,8-dihydro-9H-purin-9-yl)butyl][3-(dimethylamino)-2,2-dimethylpropyl]amino}methyl)phenyl]acetic     acid, -   Methyl     [3-({[4-(6-amino-2-butoxy-8-oxo-7,8-dihydro-9H-purin-9-yl)butyl][3-(2-oxopyrrolidin-1-yl)propyl]amino}methyl)phenyl]acetate, -   [3-({[4-(6-Amino-2-butoxy-8-oxo-7,8-dihydro-9H-purin-9-yl)butyl][3-(2-oxopyrrolidin-1-yl)propyl]amino}methyl)phenyl]acetic     acid, -   Methyl     (3-{[[4-(6-amino-2-butoxy-8-oxo-7,8-dihydro-9H-purin-9-yl)butyl](2-morpholin-4-ylethyl)amino]methyl}phenyl)acetate, -   (3-{[[4-(6-Amino-2-butoxy-8-oxo-7,8-dihydro-9H-purin-9-yl)butyl](2-morpholin-4-ylethyl)amino]methyl}phenyl)acetic     acid, -   Methyl     (3-{[[3-(6-amino-2-butoxy-8-oxo-7,8-dihydro-9H-purin-9-yl)propyl](3-morpholin-4-ylpropyl)amino]methyl}phenyl)acetate, -   Methyl     [3-({[4-(6-amino-2-butoxy-8-oxo-7,8-dihydro-9H-purin-9-yl)butyl][2-(1H-tetrazol-5-yl)ethyl]amino}methyl)phenyl]acetate, -   Methyl     (3-{[2-(6-amino-2-butoxy-8-oxo-7,8-dihydro-9H-purin-9-yl)ethyl]thio}phenyl)acetate, -   (3-{[2-(6-Amino-2-butoxy-8-oxo-7,8-dihydro-9H-purin-9-yl)ethyl]thio}phenyl)acetic     acid, -   Methyl     (3-{[2-(6-amino-2-butoxy-8-oxo-7,8-dihydro-9H-purin-9-yl)ethyl]amino}phenyl)acetate, -   Methyl     (3-{[3-(6-amino-2-butoxy-8-oxo-7,8-dihydro-9H-purin-9-yl)propyl]amino}phenyl)acetate, -   (3-{[3-(6-Amino-2-butoxy-8-oxo-7,8-dihydro-9H-purin-9-yl)propyl]amino}phenyl)acetic     acid, -   Methyl     [3-({[3-(6-amino-2-butoxy-8-oxo-7,8-dihydro-9H-purin-9-yl)propyl]amino}methyl)phenyl]acetate, -   ([3-({[3-(6-Amino-2-butoxy-8-methoxy-9H-purin-9-yl)propyl]amino}methyl)phenyl]acetic     acid, -   Methyl     (3-{[[2-(6-amino-2-butoxy-8-oxo-7,8-dihydro-9H-purin-9-yl)ethyl]     (2-methoxyethyl)amino]methyl}phenyl)acetate, -   (3-{[[2-(6-Amino-2-butoxy-8-methoxy-9H-purin-9-yl)ethyl]     (2-methoxyethyl)amino]methyl}phenyl)acetic acid, -   Methyl     (3-{[2-(6-amino-2-butoxy-8-oxo-7,8-dihydro-9H-purin-9-yl)ethyl]sulfonyl}phenyl)acetate, -   Methyl     (3-{[[2-(6-amino-2-butoxy-8-oxo-7,8-dihydro-9H-purin-9-yl)ethyl](methyl)amino]methyl}phenyl)acetate, -   (3-{[[2-(6-Amino-2-butoxy-8-oxo-7,8-dihydro-9H-purin-9-yl)ethyl](methyl)amino]methyl}phenyl)acetic     acid, -   Methyl     4-[3-(6-amino-2-butoxy-8-oxo-7,8-dihydro-9H-purin-9-yl)-2-hydroxypropoxy]benzoate, -   Methyl     (3-{[[2-(6-amino-2-butoxy-8-oxo-7,8-dihydro-9H-purin-9-yl)ethyl]     (2-hydroxyethyl)amino]methyl}phenyl)acetate, -   Methyl     (3-{[[4-(6-amino-2-butoxy-8-oxo-7,8-dihydro-9H-purin-9-yl)butyl]     (2-hydroxyethyl)amino]methyl}phenyl)acetate, -   2-Butoxy-8-oxo-9-[2-(3-hydroxycarbonylphenoxy)ethyl]adenine, -   2-Butoxy-8-oxo-9-[2-(3-hydroxycarbonylmethylphenoxy)ethyl]adenine, -   2-Butoxy-8-oxo-9-[2-(2-methoxycarbonylphenoxy)ethyl]adenine, -   2-Butoxy-8-oxo-9-[2-(2-hydroxycarbonylmethylphenoxy)ethyl]adenine, -   2-Butoxy-8-oxo-9-[2-(4-hydroxycarbonylphenoxy)ethyl]adenine, -   2-Butoxy-8-oxo-9-[2-(4-methoxycarbonylmethylphenoxy)ethyl]adenine, -   2-Butoxy-8-oxo-9-{2-[4-(2-hydroxycarbonylethyl)phenoxy]ethyl}adenine, -   2-Butoxy-8-oxo-9-[4-(3-hydroxycarbonylbenzenesulfonamide)butyl]adenine, -   2-Butoxy-8-oxo-9-[4-(3-hydroxycarbonylmethylbenzenesulfonamide)butyl]adenine, -   2-Butoxy-8-oxo-9-[4-(3-hydroxycarbonylphenylaminocarbonylamino)butyl]adenine,     and -   2-Butoxy-8-oxo-9-[4-(3-hydroxycarbonylmethylphenylaminocarbonylamino)butyl]adenine.

The present invention is explained below further in details.

“Halogen atom” is exemplified by fluorine, chlorine, bromine and iodine, among which fluorine and chlorine are preferable.

“Alkyl group” is exemplified by a straight chained or branched alkyl group of 1-10 carbons, including specifically methyl group, ethyl group, propyl group, 1-methylethyl group, butyl group, 2-methylpropyl group, 1-methylpropyl group, 1,1-dimethylethyl group, pentyl group, 3-methylbutyl group, 2-methylbutyl group, 2,2-dimethylpropyl group, 1-ethylpropyl group, 1,1-dimethylpropyl group, hexyl group, 4-methylpentyl group, 3-methylpentyl group, 2-methylpentyl group, 1-methylpentyl group, 3,3-dimethylbutyl group, 2,2-dimethylbutyl group, 1,1-dimethylbutyl group, 1,2-dimethylbutyl group, heptyl group, 1-methylhexyl group, 1-ethylpentyl group, octyl group, 1-methylheptyl group, 2-ethylhexyl group, nonyl group and decyl group, among which an alkyl group of 1-6 carbons is preferable and an alkyl group of 1-4 carbons is further preferable.

“Cycloalkyl group” is exemplified by a 3-8 membered monocyclic cycloalkyl group, including specifically cyclopropyl group, cyclobutyl group, cyclopentyl group, cyclohexyl group, cycloheptyl group and cyclooctyl group.

“Alkenyl group” is exemplified by a straight chained or branched alkenyl group of 2-8 carbons having 1-3 double bonds, including specifically ethenyl group, 1-propenyl group, 2-propenyl group, 1-methyl-ethenyl group, 1-butenyl group, 2-butenyl group, 3-butenyl group, 2-methyl-2-propenyl group, 1-pentenyl group, 2-pentenyl group, 4-pentenyl group, 3-methyl-2-butenyl group, 1-hexenyl group, 2-hexenyl group and 1-octenyl group, among which an alkenyl group of 2-4 carbons is preferable.

“Alkynyl group” is exemplified by a straight chained or branched alkynyl group of 2-8 carbons having 1 or 2 triple bonds, including specifically ethynyl group, 1-propynyl group, 2-propynyl group, 1-butynyl group, 2-butynyl group, 3-butynyl group, 1-methyl-2-propynyl group, 1-pentynyl group, 2-pentynyl group, 3-pentynyl group, 5-pentynyl group, 1-methyl-3-butynyl group, 1-hexynyl group, and 2-hexynyl group, among which an alkynyl group of 2-4 carbons is preferable.

“Alkylene” is exemplified by a straight chained or branched alkylene group of 1-6 carbons, including specifically methylene, ethylene, trimethylene, tetramethylene, pentamethylene, hexamethylene, methylmethylene, ethylmethylene, propylethylene, 1-methylethylene, 2-methylethylene, 1-methyltrimethylene, 2-methyltrimethylene, 2,2-dimethyltrimethylene, 2-methyltetramethylene and 3-methylpentamethylene.

“Cycloalkylene” is exemplified by a cycloalkylene of 3-8 carbons, which is a divalent group of a cycloalkane in the above mentioned cycloalkyl group, including specifically 1,2-cyclopropylene, 1,3-cyclobutylene, 1,2-cyclobutylene, 1,3-cyclopentylene, 1,2-cyclopentylene, 1,2-cyclohexylene, 1,3-cyclohexylene, 1,4-cyclohexylene, 1,4-cycloheptylene and 1,5-cyclooctylene.

“Alkoxy group” is exemplified by a straight chained or branched alkoxy group of 1-10 carbons, including specifically methoxy group, ethoxy group, propoxy group, 1-methylethoxy group, butoxy group, 2-methylpropoxy group, 1-methylpropoxy group, 1,1-dimethylethoxy group, pentoxy group, 3-methylbutoxy group, 2-methylbutoxy group, 2,2-dimethylpropoxy group, 1-ethylpropoxy group, 1,1-dimethylpropoxy group, hexyloxy group, 4-methylpentyloxy group, 3-methylpentyloxy group, 2-methylpentyloxy group, 1-methylpentyloxy group, 3,3-dimethylbutoxy group, 2,2-dimethylbutoxy group, 1,1-dimethylbutoxy group, 1,2-dimethylbutoxy group, heptyloxy group, 1-methylhexyloxy group, 1-ethylpentyloxy group, octyloxy group, 1-methylheptyloxy group, 2-ethylhexyloxy group, nonyloxy group and decyloxy group, among which an alkoxy group of 1-6 carbons is preferable, and an alkoxy group of 1-4 carbons is further preferable.

“Alkyl moiety” in “alkylcarbonyl group” is exemplified by the same as the above mentioned alkyl group. Preferable alkylcarbonyl group is a straight chained or branched alkylcarbonyl group of 2-5 carbons, including specifically acetyl group, propanoyl group, butanoyl group and 2-methylpropanoyl group.

“Alkoxy moiety” in “alkoxycarbonyl group” is exemplified by the same as the above mentioned alkoxy group. Preferable alkoxycarbonyl group is a straight chained or branched alkoxycarbonyl group of 2-5 carbons, including specifically methoxycarbonyl group, ethoxycarbonyl group, propoxycarbonyl group, 2-methylethoxycarbonyl group, butoxycarbonyl group and 2-methylpropoxycarbonyl group.

“Alkyl moiety” in “hydroxyalkyl group” is exemplified by the same as the above mentioned alkyl group. A hydroxyalkyl group includes specifically 2-hydroxyethyl group, 3-hydroxypropyl group, 4-hydroxybutyl group and 2-hydroxypropyl group.

“Haloalkyl group” is exemplified by an alkyl group substituted by the same or different, 1-9 halogen atoms, preferably 1-5 halogen atoms, including specifically trifluoromethyl group, 2,2,2-trifluoroethyl group, 2,2-difluoroethyl group and pentafluoroethyl group.

“Alkoxy moiety” in “hydroxyalkoxy group” is exemplified by the same as the above mentioned alkoxy group. A hydroxyalkoxy group includes specifically 2-hydroxyethoxy group, 3-hydroxypropoxy group, 4-hydroxybutoxy group and 2-hydroxypropoxy group.

“Haloalkoxy group” is exemplified by an alkoxy group substituted by the same or different, 1-9 halogen atoms, preferably 1-5 halogen atoms, including specifically trifluoromethoxy group, 2,2,2-trifluoroethoxy group, 2,2-difluoroethoxy group and pentafluoroethoxy group.

“Alkyl moiety” in “alkylamino group” is exemplified by the same as the above mentioned alkyl group as above. Preferable alkylamino group is a straight chained or branched alkylamino group of 1-4 carbons, including specifically methylamino group, ethylamino group, propylamino group, 2-methylethylamino group and butylamino group.

Two alkyl moieties in “dialkylamino group” may be the same or different, and the alkyl moiety is exemplified by the same as the above mentioned alkyl group. Preferable dialkylamino group is a straight chained or branched dialkylamino group in which each alkyl moiety has 1-4 carbons, including specifically dimethylamino group, diethylamino group, dipropylamino group, methylethylamino group, methylpropylamino group and ethylpropylamino group.

“Cyclic amino group” is exemplified by a saturated 4-7 membered cyclic amino group containing 1-2 hetero atoms selected from 1-2 nitrogen atoms, 0-1 oxygen atom and 0-1 sulfur atom, including specifically azetidinyl group, piperidinyl group, piperazinyl group, morpholino group and thiomorpholino group. The cyclic amino group may be substituted with a halogen atom, hydroxy group, oxo group, an alkyl group, an alkoxy group, an alkylcarbonyl group or an alkoxycarbonyl group.

“Aryl group” is exemplified by a 6-10 membered aryl group, including specifically phenyl group, 1-naphthyl group and 2-naphthyl group.

“Heteroaryl group” is exemplified by a 5-10 membered mono or bicyclic heteroaryl group containing 1-4 hetero atoms selected from 0-2 nitrogen atoms, 0-1 oxygen atom and 0-1 sulfur atom, including specifically furyl group, thienyl group, pyrrolyl group, pyridyl group, indolyl group, isoindolyl group, quinolyl group, isoquinolyl group, pyrazolyl group, imidazolyl group, pyrimidinyl group, pyrazinyl group, pyridazinyl group, thiazolyl group and oxazolyl group. The bonding site in the heteroaryl group is not specifically limited and it may be on any of the nitrogen or carbon atoms.

“6-10 Membered aromatic carbocyclic ring” shown by ring A in the formula (1) is exemplified by benzene ring and naphthalene ring.

“5-10 Membered heteroaromatic ring” shown by ring A is exemplified by a 5-10 membered monocyclic or bicyclic heteroaromatic ring containing 1-4 hetero atoms selected from 0-4 nitrogen atoms, 0-2 oxygen atoms and 0-2 sulfur atoms, including specifically pyrrole ring, furan ring, thiophene ring, pyrazole ring, imidazole ring, oxazole ring, thiazole ring, isoxazole ring, isothiazole ring, pyridine ring, pyridazine ring, pyrimidine ring, pyrazine ring, triazine ring, quinoline ring, isoquinoline ring, indole ring, benzofuran ring, benzothiophene ring, indazole ring, benzoisoxazole ring, benzoisothiazole ring, benzoimidazole ring, benzoxazole ring, benzothiazole ring, phthalazine ring, quinazoline ring and quinoxaline ring.

The bonding site in the heteroaromatic ring is not specifically limited and it may be on any of the nitrogen or carbon atoms. Preferable heterocyclic ring shown by ring A is pyridine ring, furan ring, thiophene ring, pyrrole ring, indole ring and oxazole ring, further preferable one is pyridine ring, furan ring and thiophene ring.

The group shown by the formula (2):

wherein ring A, R, n, Y³ and R² are the same defined in the above, is preferably one selected from the group consisting of following formulas (3) to (9):

wherein n, R and R² have the same meaning as above, and R³ is a hydrogen atom or an alkyl group, preferably hydrogen atom.

In the formula (1), R is preferably exemplified by a halogen atom such as fluorine atom and chlorine atom, an alkyl group of 1-4 carbons such as methyl group and ethyl group, an alkoxy group of 1-4 carbons such as methoxy group and ethoxy group, a haloalkyl group of 1-2 carbons such as trifluoromethyl group, difluoromethyl group and 2,2,2-trifluoroethyl group, a haloalkoxy group of 1-2 carbons such as trifluoromethoxy group, difluoromethoxy group and 2,2,2-trifluoroethoxy group, a dialkylamino group of 1-5 carbons such as dimethylamino group, diethylamino group, ethylmethylamino group and dipropylamino group, and a cyclic amino group such as morpholino group, piperidino group, piperazino group and pyrrolidino group, and the cyclic amino group may be substituted with a halogen atom, hydroxy group, an alkyl group, an alkoxy group, an alkylcarbonyl group or an alkoxycarbonyl group.

In the formula (1), n is preferably 0 or 1.

In the substituted or unsubstituted alkyl group, the substituted or unsubstituted alkenyl group, the substituted or unsubstituted alkynyl group and the substituted or unsubstituted cycloalkyl group shown by R² in the formula (1), the substituent is exemplified by a halogen atom, hydroxy group, an alkoxy group, an acyloxy group, amino group, an alkylamino group, a dialkylamino group and a cyclic amino group.

The acyloxy group is exemplified by acyloxy group of 2-10 carbons, including a substituted or unsubstituted alkylcarbonyloxy group of 2-5 carbons, a substituted or unsubstituted alkenylcarbonyloxy group of 2-5 carbons, a substituted or unsubstituted alkynylcarbonyloxy group of 2-5 carbons, a substituted or unsubstituted arylcarbonyloxy group and a substituted or unsubstituted heteroarylcarbonyloxy group. The alkyl, alkenyl and alkynyl in the above alkylcarbonyloxy group, alkenylcarbonyloxy group and alkynylcarbonyloxy group are exemplified by the same as the above mentioned alkyl group, alkenyl group and alkynyl group, respectively.

The substituent in the substituted alkylcarbonyloxy group, alkenylcarbonyloxy group and alkynylcarbonyloxy group is exemplified by a halogen atom, hydroxy group, an alkoxy group and an aryl group.

The aryl moiety in the above arylcarbonyloxy group is exemplified by the same as the above mentioned aryl group. The heteroaryl in the above heteroarylcarbonyloxy group is exemplified by the same as the above mentioned heteroaryl group. The substituent in the above substituted aryl group and heteroaryl group is exemplified by a halogen atom, hydroxy group, an alkoxy group, a haloalkyl group, a haloalkoxy group, an alkylcarbonyl group, amino group, an alkylamino group and a dialkylamino group.

The substituent in the substituted or unsubstituted alkyl group in the groups R⁵ and R⁶ in the formula (1) is exemplified by a halogen atom, hydroxy group, an alkoxy group, a carboxy group, an alkoxycarbonyl group, carbamoyl group, an alkylamino group, a dialkylamino group, a cyclic amino group, carboxy group and tetrazolyl group which may be substituted by an alkyl group, wherein the groups R⁵ and R⁶ may be substituted with one or more substituents, preferably 1-3 substituents.

The cyclic amino group includes specifically piperidino group, piperazino group, pyrrolidino group, morpholino group, thiomorpholino group, pyrrolidon-1-yl group and succinimide-1-yl group, 4-hydroxypiperidino group and 4-methylpiperidino group.

R² is preferably hydrogen atom, an alkyl group of 1-4 carbons, an acyloxyalkyl group, or an alkyl group of 1-6 carbons substituted by amino group, an alkylamino group, a dialkylamino group or a cyclic amino group. The acyloxyalkyl group is exemplified specifically by acetoxymethyl group, 1-acetoxyethyl group and benzoyloxymethyl group. Further preferably, R² is methyl group, or an alkyl group of 1-4 carbons substituted by amino group, an alkylamino group, a dialkylamino group or a cyclic amino group.

The compound in the formula (1) wherein R² represents hydrogen atom is also useful as the synthetic intermediate of the compound wherein R² represents except hydrogen atom. The compound in the formula (1) wherein R² represents hydrogen atom is also useful as a reagent for testing pharmacokinetics of the compound wherein R² represents except hydrogen atom because the former corresponds to a metabolite of the latter.

In the formula (1), Y² is preferably a single bond or a straight chained alkylene group of 1-4 carbons, including specifically methylene, ethylene, trimethylene and tetramethylene.

In the formula (1), Y³ is preferably a single bond or a straight chained or branched alkylene of 1-4 carbons, including specifically methylene, ethylene, trimethylene, tetramethylene and methylmethylene.

In the formula (1), X² is preferably oxygen atom, NHSO₂, NHCONH and NR⁵.

In the formula (1), Z¹ is preferably a straight chained or branched alkylene of 1-5 carbons, including specifically methylene, ethylene, trimethylene, tetramethylene and pentamethylene, 2-methylmethylene, 2-methylethylene, 1-methylethylene, 2-methylpropylene and 2,2-dimethylpropylene. Still further preferably Z¹ is ethylene, trimethylene and tetramethylene. The alkylene may be substituted by hydroxy group, oxo group, etc.

In the formula (1), when X¹ is NR⁴, R⁴ is preferably hydrogen atom and an alkyl group of 1-3 carbons, more preferably hydrogen atom and methyl group. X¹ is preferably oxygen atom and sulfur atom, more preferably oxygen atom.

In the formula (1), Y¹ is preferably alkylene of 1-6 carbons, including specifically methylene, ethylene, trimethylene, tetramethylene, pentamethylene and heptamethylene, more preferably a straight chained alkylene of 1-5 carbons.

In the formula (1), R¹ is preferably hydrogen atom, hydroxy group, a straight chained or branched alkoxy group of 1-4 carbons, a straight chained or branched alkoxycarbonyl group of 2-5 carbons, a haloalkyl group of 1 or 2 carbons, a haloalkoxy group of 1 or 2 carbons and a substituted or unsubstituted aryl group. The aryl group is preferably phenyl group.

The substituent in the substituted aryl group and the substituted heteroaryl group is exemplified by a halogen atom, hydroxy group, an alkyl group, an alkoxy group, a haloalkyl group, a haloalkoxy group, an alkylcarbonyl group, amino group, an alkylamino group and a dialkylamino group.

More preferably R¹ is hydrogen atom, hydroxy group, a straight chained or branched alkoxy group of 1-4 carbons and a straight chained or branched alkoxycarbonyl group of 2-5 carbons.

The above alkoxy group is specifically exemplified by methoxy group and ethoxy group. The above alkoxycarbonyl group is specifically exemplified by methoxycarbonyl group and ethoxycarbonyl group. The above haloalkyl group is specifically exemplified by trifluoromethyl group. The above haloalkoxy group is specifically exemplified by trifluoromethoxy group.

The adenine compound of the present invention, in accordance with the kind of the substituent includes all tautomers, geometrical isomers, stereoisomers, and a mixture thereof.

Namely, in a case where there are one or more asymmetrical carbons in the compound of the formula (1), there exist diastereomers and optical isomers, and mixtures of those diastereomers and optical isomers and separated ones are also included in the present invention.

Additionally, the adenine compound shown by the formula (1) and its tautomers are chemically equivalent, and the adenine compound of the present invention includes the tautomers. The tautomer is specifically a hydroxy compound shown by the formula (1′):

wherein ring A, n, R, R¹, R², X¹, X², Y¹, Y², Y³ and Z¹ have the same meanings as above.

The pharmaceutically acceptable salt is exemplified by an acid salt and a base salt. The acid salt is, for example, an inorganic acid salt such as hydrochloride, hydrobromide, sulfate, hydroiodide, nitrate and phosphate, and an organic acid salt such as citrate, oxalate, acetate, formate, propionate, benzoate, trifluoroacetate, maleate, tartrate, methanesulfonate, benzenesulfonate and p-toluenesulfonate, and the base salt is exemplified by an inorganic base salt such as sodium salt, potassium salt, calcium salt, magnesium salt and ammonium salt, and an organic base salt such as triethylammonium salt, triethanolammonium salt, pyridinium salt and diisopropylammonium salt, and further a basic or acidic amino acid salt such as arginine salt, aspartic acid salt and glutamic acid salt. The compound shown by the formula (1) may be hydrate and a solvate such as ethanolate.

The compound shown by the formula (1) can be prepared by the following methods. The starting compounds not disclosed in the below can be prepared by a similar method to the following method or by a known method or its similar method.

Preparation Method 1

wherein L represents a leaving group, and R¹, Y¹, X¹ and Z¹ have the same meanings as above, and X³ is a group shown by the following formula:

(wherein ring A, n, R, R², X², Y² and Y³ have the same meanings as above), a leaving group, amino group, hydroxy group, mercapto group, carboxy group or sulfonic acid group.

The compound (II) can be obtained by reacting the compound (I) with the compound (IX) in the presence of a base.

As the base, use can be made of an alkali metal carbonate such as sodium carbonate and potassium carbonate, an alkaline earth metal carbonate such as calcium carbonate, a metal hydroxide such as sodium hydroxide and potassium hydroxide, a metal hydrogenate such as sodium hydride, a metal alkoxide such as potassium t-butoxide. As the solvent, use can be made of a halogenated hydrocarbon such as carbon tetrachloride, chloroform and methylene chloride, an ether such as diethyl ether, tetrahydrofuran and 1,4-dioxane, and an aprotic solvent such as dimethylformamide, dimethyl sulfoxide and acetonitrile. The reaction temperature is selected from a range of about 0° C. to around the boiling point of the solvent.

The compound (III) can be obtained by brominating the compound (II). As the brominating agent, use can be made of bromine, hydroperbromic acid and N-bromosuccinimide. In this reaction, a reaction auxiliary such as sodium acetate may be added. As the solvent, use can be made of a halogenated hydrocarbon such as carbon tetrachloride, methylene chloride and dichloroethane, ether such as diethyl ether, acetic acid and carbon disulfide. The reaction temperature is selected from a range of about 0° C. to around the boiling point of the solvent.

The compound (VI) can be obtained by reacting the compound (III) with a metal alkoxide such as sodium methoxide, followed by treating under acidic conditions.

As the solvent on reacting with the metal alkoxide, use is made of an ether such as diethyl ether, tetrahydrofuran and 1,4-dioxane, an aprotic solvent such as dimethylformamide and an alcohol such as methanol corresponding to the metal alkoxide used. The reaction temperature is selected from a range of room temperature to around the boiling point of the solvent.

As the acid to be used in the acid treatment, use can be made of an inorganic acid such as hydrochloric acid, hydrobromic acid and sulfuric acid and an organic acid such as trifluoroacetic acid. As the solvent, use is made of ether such as diethyl ether and tetrahydrofuran, an aprotic solvent such as dimethylformamide and acetonitrile and an alcohol such as methanol and ethanol. The reaction temperature is selected from a range of room temperature to around the boiling point of the solvent.

The compound (VIII) can be obtained by reacting the compound (VI) with the compound (X).

In a case where X¹ is NR⁴, the reaction is conducted in the presence or absence of a base. As the base, use can be made of an alkali metal carbonate such as sodium carbonate and potassium carbonate, an alkaline earth metal carbonate such as calcium carbonate, a metal hydroxide such as sodium hydroxide and potassium hydroxide and an organic base such as triethylamine, diisopropylethylamine and 4-dimethylamino pyridine. As the solvent, use can be made of an ether such as tetrahydrofuran, 1,4-dioxane and diglyme, an alcohol such as propanol and butanol and an aprotic solvent such as dimethylformamide. The reaction temperature is selected from a range of about 50° C. to about 200° C. The reaction may be carried out in the absence of a solvent.

In a case where X¹ is oxygen atom or sulfur atom, the reaction is conducted in the presence of a base. As the base, use can be made of an alkali metal such as sodium and potassium and an alkali metal hydride such as sodium hydride. As the solvent, use can be made of an ether such as tetrahydrofuran, 1,4-dioxane and diglyme, and an aprotic solvent such as dimethylformamide and dimethyl sulfoxide. The reaction may be carried out in the absence of a solvent. The reaction temperature is selected from a range of about 50° C. to about 200° C.

In a case where X¹ is SO₂, an intermediate wherein the corresponding X¹ is sulfur atom is oxidized by oxone (registered trade mark) or m-chloroperbenzoic acid (mCPBA).

In the process of preparing the compound (VIII) from the compound (I), the compound (V) can also be synthesized from the compound (II) by the same method as above, or the compound (VIII) can also be obtained by synthesizing the compound (V) from the compound (I) through the compound (IV) and converting the resultant to the compound (VII) which is then converted to the object.

Preparation Method 2

wherein L is a leaving group, R¹, Y¹, X¹ and Z¹ have the same meanings as above, X is amino group, hydroxy group or mercapto group, and X³ is a group shown by the following formula:

(wherein ring A, n, R, R², X², Y² and Y³ have the same meanings as above), a leaving group, amino group, hydroxy group, mercapto group, carboxy group or sulfonic acid group.

The compound (XII) can be obtained by reacting the compound (XI) with the compound (XIV) in the presence of a base.

As the base, use can be made of an alkali metal carbonate such as sodium carbonate and potassium carbonate, an alkaline earth metal carbonate such as calcium carbonate, a metal hydroxide such as sodium hydroxide and potassium hydroxide, an organic base such as triethylamine, diisopropylethylamine, pyridine and 4-dimethylaminopyridine, a metal alkoxide such as sodium methoxide. As the solvent, use can be made of a halogenated hydrocarbon such as methylene chloride, an ether such as diethyl ether, tetrahydrofuran and 1,4-dioxane, an alcohol such as methanol and ethanol, and an aprotic solvent such as dimethylformamide, dimethyl sulfoxide and acetonitrile. The reaction temperature is selected from a range of about 0° C. to around the boiling point of the solvent.

The compound (VIII) can be obtained by reacting the compound (XII) with the compound (XV) in the presence or absence of a base.

As the base, use can be made of an inorganic base including an alkali metal carbonate such as sodium carbonate and potassium carbonate, an alkaline earth metal carbonate such as calcium carbonate, a metal hydroxide such as sodium hydroxide and potassium hydroxide, an organic base such as triethylamine, diisopropylethylamine, pyridine and 4-dimethylaminopyridine, a metal alkoxide such as sodium methoxide. As the solvent, use can be made of an ether such as tetrahydrofuran, 1,4-dioxane and diglyme, an alcohol such as methanol and ethanol, and an aprotic solvent such as toluene, dimethylformamide and dimethyl sulfoxide. The reaction may be carried out in the absent of a solvent. The reaction temperature is selected from a range of room temperature to around the boiling point of the solvent.

In the process for preparing the compound (VIII) from the compound (XII), the compound (VIII) can also be obtained by synthesizing the compound (XIII) and then reacting it with the compound (XVI).

In a case where X is amino group, the compound (XIII) can be obtained by reacting the compound (XII) with guanidine in the presence or absence of a base.

As the base, use can be made of an alkali metal carbonate such as sodium carbonate and potassium carbonate, an alkaline earth metal carbonate such as calcium carbonate, a metal hydroxide such as sodium hydroxide and potassium hydroxide, an organic base such as triethylamine, diisopropylethylamine, pyridine and 4-dimethylaminopyridine, a metal alkoxide such as sodium methoxide.

As the solvent, use can be made of an ether such as tetrahydrofuran, 1,4-dioxane and diglyme, an alcohol such as methanol and ethanol, and an aprotic solvent such as toluene, dimethylformamide and dimethyl sulfoxide. The reaction may be carried out in the absence of a solvent. The reaction temperature is selected from a range of room temperature to around the boiling point of the solvent.

In a case where X is hydroxy group, the compound (XIII) can be obtained by reacting the compound (XII) with urea in the presence or absence of a base. As the base, use can be made of an alkali metal carbonate such as sodium carbonate and potassium carbonate, an alkaline earth metal carbonate such as calcium carbonate, a metal hydroxide such as sodium hydroxide and potassium hydroxide, an organic base such as triethylamine, diisopropylethylamine, pyridine and 4-dimethylaminopyridine, and a metal alkoxide such as sodium methoxide.

As the solvent, use can be made of an ether such as tetrahydrofuran, 1,4-dioxane and diglyme, an alcohol such as methanol and ethanol, and an aprotic solvent such as toluene, dimethylformamide and dimethyl sulfoxide. The reaction may be carried out in the absence of a solvent. The reaction temperature is selected from a range of room temperature to around the boiling point of the solvent.

In a case where X is mercapto group, the compound (XIII) can be obtained by reacting the compound (XII) with benzoylisothiocyanate in the presence or absence of a base, followed by cyclization. In the reaction with benzoylisothiocyanate, as the base, use can be made of an alkali metal carbonate such as sodium carbonate and potassium carbonate, an alkaline earth metal carbonate such as calcium carbonate and an organic base such as triethylamine, diisopropylethylamine, pyridine and 4-dimethylaminopyridine. As the solvent, use can be made of a halogenated hydrocarbon such as methylene chloride, an ether such as tetrahydrofuran and 1,4-dioxane and an aprotic solvent such as dimethylformamide and dimethyl sulfoxide. The reaction temperature is selected from a range of 0° C. to around the boiling point of the solvent.

In the cyclization reaction, as the base, use can be made of an alkali metal hydroxide such as sodium hydroxide and potassium hydroxide and a metal alkoxide such as sodium methoxide and potassium t-butoxide. As the solvent, use can be made of an ether such as tetrahydrofuran, an alcohol such as ethanol and 2-propanol and an aprotic solvent such as dimethylformamide and dimethyl sulfoxide. The reaction temperature is selected from a range of around room temperature to around the boiling point of the solvent.

The compound (VIII) can be obtained by reacting the compound (XIII) with the compound (XVI) in the presence of a base. As the base, use can be made of an alkali metal carbonate such as sodium carbonate and potassium carbonate, an alkaline earth metal carbonate such as calcium carbonate, a metal hydroxide such as sodium hydroxide and potassium hydroxide, a metal hydrogenate such as sodium hydride, an organic base such as triethylamine, diisopropylethylamine, pyridine and 4-dimethylaminopyridine and a metal alkoxide such as potassium t-butoxide. As the solvent, use can be made of a halogenated hydrocarbon such as carbon tetrachloride, chloroform and methylene chloride, an ether such as diethyl ether, tetrahydrofuran and 1,4-dioxane and an aprotic solvent such as dimethylformamide, dimethyl sulfoxide and acetonitrile. The reaction temperature is selected from a range of about 0° C. to around the boiling point of the solvent.

Preparation Method 3

wherein ring A, n, R, R¹, R², X¹, X², Y¹, Y², Y³ and Z¹ have the same meanings as above.

In a case where X³ is a leaving group, amino group, hydroxy group, mercapto group, carboxy group or sulfonic acid group in the above formula (II) to (XVI), each of them can be respectively converted to the compound (XVIII) according to a method known to the skilled artisan or similar thereto. Those methods are, for example, disclosed in “Comprehensive Organic Transformations, R. C. Lalock (VCH Publishers, Inc. 1989)”. Those methods are concretely explained below.

(1) A Case where X³ is a Leaving Group

wherein ring A, n, R, R¹, R², X¹, X², Y¹, Y², Y³ and Z¹ have the same meanings as above, and X⁴ is oxygen atom, sulfur atom or NR⁵.

The compound (XX) can be obtained by reacting the compound (V) (wherein X³ is a leaving group) with the compound (XXI).

In case where X⁴ is NR⁵, the reaction is conducted in the presence or absence of a base. As the base, use can be made of an alkali metal carbonate such as sodium carbonate and potassium carbonate, an alkaline earth metal carbonate such as calcium carbonate, a metal hydroxide such as sodium hydroxide and potassium hydroxide and an organic base such as triethylamine, diisopropylethylamine and 4-dimethylaminopyridine. As the solvent, use can be made of an ether such as tetrahydrofuran and 1,4-dioxane and diglyme, an alcohol such as propanol and butanol and an aprotic solvent such as dimethylformamide, dimethyl sulfoxide or acetonitrile. The reaction may also be carried out in the absence of a solvent. The reaction temperature is selected from a range of room temperature to around the boiling point of the solvent.

In case where X⁴ is oxygen atom or sulfur atom, the reaction is conducted in the presence of a base. As the base, use can be made of an alkali metal such as sodium or potassium or a alkali metal hydride such as sodium hydride. As the solvent, use can be made of an ether such as tetrahydrofuran and 1,4-dioxane and diglyme and an aprotic solvent such as dimethylformamide or dimethyl sulfoxide. The reaction may also be carried out in the absence of a solvent. The reaction temperature is selected from a range of room temperature to around the boiling point of the solvent.

(2) A Case where X³ is Amino Group

i) A Case where X² is NR⁵CO, NR⁵SO₂, NR⁵CONR⁶ or NR⁵CSNR⁶

wherein ring A, n, R, R¹, R², X¹, X², Y¹, Y², Y³ and Z¹ have the same meanings as above, X⁵ is COCl, SO₂Cl, NCO or NCS, and X⁶ is NR⁵CO, NR⁵SO₂, NR⁵CONR⁶ or NR⁵CSNR⁶.

The compound (XX) can be obtained by reacting the compound (V) (wherein X³ is amino group) with the compound (XXII) in the presence or absence of a base. As the base, use can be made of an alkali metal carbonate such as sodium carbonate and potassium carbonate, an alkaline earth metal carbonate such as calcium carbonate and an organic base such as triethylamine, diisopropylethylamine and 4-dimethylaminopyridine. As the solvent, use can be made of a halogenated hydrocarbon such as carbon tetrachloride, chloroform and methylene chloride, an ether such as diethyl ether, tetrahydrofuran and 1,4-dioxane and an aprotic solvent such as toluene and xylene. The reaction temperature is selected from a range of about 0° C. to around the boiling point of the solvent.

ii) A Case where X² is NR⁵

The compound (XIX-2) or the compound (XIX-3) which corresponds to the compound of formula (1) can be obtained by the following process.

wherein ring A, n, R, R¹, R², R⁵, X¹, X², Y¹, Y², Y³, Z¹ and L have the same meanings as above, and Y^(2′) is combined with methylene to represent Y².

The compound (XIX-2) can be obtained by reacting the compound (V) with the aldehyde compound (XXII-2) using a reducing agent such as sodium borohydride (NaBH₄) in a solvent such as methanol. When R⁵ is except hydrogen atom, the compound (XIX-3) can be obtained by reacting the compound (XIX-2) with alkylating reagent such as a halogenated alkyl reagent in the presence of a base such as potassium carbonate in a solvent such as acetonitrile or dimethylformamide.

The compound (XIX-2) or the compound (XIX-3) can be also obtained in the following process.

wherein ring A, n, R, R¹, R², R⁵, X¹, X², Y¹, Y², Y³, Z¹ and L have the same meanings as above, and L′ and L″ is the same or different, and is a leaving group.

The compound (V-3) can be obtained by reacting the compound (IV) with the compound shown as L″-Z¹-L′ such as alkylene dihalide in the presence of a base such as potassium carbonate in the solvent such as dimethylformamide. The compound (XIX-2) can be obtained by reacting the compound (V-3) with the compound (XXII-3) under the same condition. The compound (XIX-2) is converted to the compound (XIX-3) wherein R⁵ is the group except hydrogen in the same manner as mentioned above.

The compound (XIX-3) can be also obtained by the following process.

wherein ring A, n, R, R¹, R², R⁵, X¹, X², Y¹, Y², Y³, L^(′) and L″ have the same meanings as above.

The compound (XXII-4) can be obtained by alkylating the compound (XXII-3) in the two-steps process. The compound (XIX-3) can be obtained by condensing the compound (XXII-4) with the compound (IV) in the presence of a base such as potassium carbonate in a solvent such as dimethylformamide. In the case of the compound (XIX-3) wherein R⁵ represent hydrogen atom, the compound (XXII-4) can be obtained by reacting the compound (XXII-3) with the compound shown as L″-Z¹-L′ such as alkylene dihalide.

The amino group in the compound (V) can be protected if necessary, and the protecting group of the amino group can be deprotected to give the compound (V) wherein X³ represents amino group. For example, the compound (V-1) can be obtained by reacting the compound (IV) with the compound (IX-2) in the presence of a base such as potassium carbonate in a solvent such as dimethylformamide. The obtained compound can be treated with hydrazine in a solvent such as ethanol to give the compound (V-2), namely the compound (V) wherein X³ represents amino group.

wherein R¹, X¹, Y¹, Z¹ and L have the same meanings as above.

(3) A Case where X³ is Carboxy Group or Sulfonic Acid Group

wherein ring A, n, R, R¹, R², R⁵, X¹, X², Y¹, Y², Y³ and Z¹ have the same meanings as above, and X⁷ is CONR⁵ or SO₂NR⁵.

The compound (XX) can be obtained by converting the compound (V) wherein X³ is carboxy group or sulfonic acid group to an acid halide compound and then reacting it with the compound (XXIII) in the presence or absence of a base. As the halogenating agent, use can be made of thionyl chloride, phosphoryl chloride, phosphorus pentachloride and phosphorus trichloride. As the solvent, use can be made of a halogenated hydrocarbon such as carbon tetrachloride, chloroform and methylene chloride, an ether such as diethyl ether, tetrahydrofuran and 1,4-dioxane and an aprotic solvent such as toluene and xylene. The reaction temperature is selected from a range of about 0° C. to around the boiling point of the solvent. As the base, use can be made of an alkali metal carbonate such as sodium carbonate and potassium carbonate, an alkaline earth metal carbonate such as calcium carbonate and an organic base such as triethylamine, diisopropylethylamine and 4-dimethylaminopyridine.

Each step described in the preparation method 3 can be conducted with the use of any of the compounds in the preparation method 1 or 2 as a starting material, so far as it does not hinder the preparation steps after the present preparation step, and can be conducted by any of the reaction scheme described in the preparation method 1 or 2. Further, in the preparation method 3, the compound of the formula (XX) can be converted to the compound of the formula (XIX) by the method described in the preparation method 1.

Preparation Method 4

wherein L is a leaving group, and R¹, Y¹, X¹, Z¹ and X³ have the same meanings as above.

The compound (XXV) can be obtained by reacting the compound (XXIV) with ammonia in an aqueous solution, an organic solvent or a mixture of water and an organic solvent.

The organic solvent includes an alcohol such as methanol, ethanol, propanol, and butanol, an ether such as tetrahydrofuran, 1,4-dioxane and diglyme, an aprotic solvent such as acetonitrile. The reaction temperature is selected from, for instance, around room temperature to 200° C. A reaction vessel such as an autoclave may optionally be used in the reaction.

The compound (XXVI) can be obtained in the same manner as the synthesis of the compound (III) using the compound (XXV).

The compound (XXVII) can be obtained by reacting the compound (XXVI) with sodium methoxide.

As the organic solvent, use is made of an ether such as diethyl ether, tetrahydrofuran and 1,4-dioxane, an aprotic solvent such as dimethylformamide and an alcohol such as methanol.

The reaction temperature is selected from, for instance, a range of room temperature to around the boiling point of the solvent.

Further, the compound (XXVII) can be obtained by treating the compound (XXVI) with an aqueous alkaline solution containing methanol.

As the aqueous alkaline solution, use is made of an aqueous solution of an alkali metal hydroxide such as sodium hydroxide and potassium hydroxide solution. The reaction temperature is selected from, for instance, a range of room temperature to around the boiling point of the solvent.

The compound (XXX) can be obtained in the same manner as the synthesis of the compound (VIII) using the compound (XXVII) in the preparation method 1.

Additionally, in the step from the compound (XXV) to the compound (XXX), the compound (XXVIII) is prepared by the same method as above, and it is converted into the compound (XXIX). The compound (XXX) can also be obtained from the compound (XXIX).

The compound (XXXI) can be obtained by treating the compound (XXX) with trifluoroacetic acid in the solvent such as methanol.

The compound (XXXII) can be prepared using the compound (XXXI) in the same manner as the synthesis of the compound (II) from the compound (I), or the synthesis of the compound (V) from the compound (IV) in the preparation method 1.

The compound (VIII) can be obtained by acid treatment of the compound (XXXII).

As the acid, use can be made of, for instance, an inorganic acid such as hydrochloric acid, hydrobromic acid and sulfuric acid, and an organic acid such as trifluoroacetic acid.

As the solvent, use can be made of, for instance, water, and a mixture of water and an organic solvent. The organic solvent is exemplified by an ether such as diethyl ether and tetrahydrofuran, an aprotic solvent such as dimethylformamide and acetonitrile and an alcohol such as methanol and ethanol. The reaction temperature is selected from, for instance, a range from room temperature to around the boiling point of the solvent.

The compound (XXXII) wherein X³ represents a leaving group, amino group, hydroxy group, mercapto group, carboxy group or sulfonic acid group can be converted into the compound (XVIII-2):

wherein ring A, n, R, R¹, R², X¹, X², Y¹, Y², Y³ and Z¹ have the same meanings as above, by using a method described in the above mentioned preparation method 3. And then, the compound (XVIII-2) is subjected to deprotection of the methoxy group by the acid treatment mentioned above to prepare the compound (XVIII):

wherein ring A, n, R, R¹, R², X¹, X², Y¹, Y², Y³ and Z¹ have the same meanings as above.

The compound (XXXII) can also be subjected to deprotection of the methoxy group by the above mentioned acid treatment to give the 8-oxo-compound (VIII), and then the compound (VIII) is converted into the compound (XVIII) by using the preparation method 3.

In a case where the adenine compound of the present invention, its intermediate or the starting compound contains a functional group, a reaction for increasing a carbon atom, a reaction for introducing a substituent or a reaction for conversion of the functional group can be conducted optionally according to a manner conventional to the skilled artisan in an appropriate step, namely in an intermittent step in each of the preparation methods described in the preparation method 1 or 2. For this purpose, the methods described in “JIKKEN KAGAKU-KOZA (edited by NIHON KAGAKU-KAI, MARUZEN)”, or “Comprehensive Organic Transformation, R. C. Lalock (VCH Publishers, Inc. 1989)” can be used. The reaction for increasing a carbon atom includes a method comprising converting an ester group to hydroxymethyl group using a reducing agent such as aluminum lithium hydride, introducing a leaving group and then introducing a cyano group. The reacting for conversion of a functional group includes a reaction for conducting acylation or sulfonylation using an acid halide, a sulfonyl halide, etc., a reaction for reacting an alkylation agent such as a halogenated alkyl, a hydrolysis reaction, a reaction for C—C bond formation such as Friedel-Crafts reaction and Wittig reaction, and oxidation reaction, a reducing reaction, etc.

In a case where the compound of the present invention or its intermediate contains a functional group such as amino group, carboxy group, hydroxy group and oxo group, a technology of protection and de-protection can optionally be used. A preferable protecting group, a protection method and a deprotection method are described in details in “Protective Groups in Organic Synthesis 2nd Edition (John Wiley & Sons, Inc.; 1990)”, etc.

The compound (1) of the present invention and the intermediate compound for production thereof can be purified by a method known to the skilled artisan. For instance, purification can be conducted by column chromatography (e.g. silica gel column chromatography or ion exchange chromatography) or recrystallization. As the recrystallization solvent, for instance, use can be made of an alcohol such as methanol, ethanol and 2-propanol, an ether such as diethyl ether, an ester such as ethyl acetate, an aromatic hydrocarbon such as benzene and toluene, a ketone such as acetone, a hydrocarbon such as hexane, an aprotic solvent such as dimethylformamide and acetonitrile, water and a mixture of two or more thereof. As other purification method, use can be made of those described in “JIKKEN KAGAKU-KOZA (edited by NIHON KAGAKU-KAI, MARUZEN) Vol. 1”, etc.

In a case where the compound of the formula (1) of the present invention contains one or more asymmetric carbons, its production can be conducted by using the starting material containing those asymmetric carbons or by introducing the asymmetric carbons during the production steps. For instance, in a case of an optical isomer, it can be obtained by using an optically active starting material or by conducting an optical resolution at a suitable stage of the production steps. The optical resolution method can be conducted by a diastereomer method comprising allowing the compound of the formula (1) or its intermediate to form a salt with an optically active acid (e.g. a monocarboxylic acid such as mandelic acid, N-benzyloxy alanine and lactic acid, a dicarboxylic acid such as tartaric acid, o-diisopropylidene tartrate and malic acid, a sulfonic acid such as camphor sulfonic acid and bromocamphor sulfonic acid) in an inert solvent (e.g. an alcohol such as methanol, ethanol, and 2-propanol, an ether such as diethyl ether, an ester such as ethyl acetate, a hydrocarbon such as toluene, an aprotic solvent such as acetonitrile and a mixture of two or more thereof).

In a case where the compound of the formula (1) or its intermediate contains a functional group such as carboxylic group, the object can be attained also by forming a salt with an optically active amine (e.g. an organic amine such as α-phenethylamine, quinine, quinidine, cinchonidine, cinchonine and strychinene).

The temperature for formation of the salt is selected from room temperature to the boiling point of the solvent. In order to increase optical purity, the temperature is preferably once increased up to the boiling point of the solvent. Upon recovering the salt formed by filtration, the yield can be increased optionally by cooling. An amount of the optical active acid or amine is about 0.5 to about 2.0 equivalent, preferably around 1 equivalent, relative to the substrate. An optically active salt with highly optical purity can be obtained optionally by recrystallization from an inert solvent (e.g. an alcohol such as methanol, ethanol and 2-propanol, an ether such as diethyl ether, an ester such as ethyl acetate, a hydrocarbon such as toluene, an aprotic solvent such as acetonitrile and a mixture of two or more thereof). If necessary, the optically resoluted salt can be converted into a free form by treating with an acid or a base by the conventional method.

The 8-oxoadenine compound and its pharmaceutically acceptable salt of the present invention is useful as an immuno-modulator and thus useful as a therapeutic and prophylactic agent for diseases associated with an abnormal immune response (e.g. autoimmune diseases and allergic diseases) and various infections and cancers which are required for activation of an immune response. For instance, the 8-oxoadenine compound and its pharmaceutically acceptable salt is useful as a therapeutic and prophylactic agent for the diseases mentioned in the following (1)-(8).

(1) Respiratory diseases: asthma, including bronchial, allergic, intrinsic, extrinsic, exercise-induced, drug-induced (including NSAID such as aspirin and indomethacin) and dust-induced asthma; intermittent and persistent and of all severities, and other causes of airway hyper-responsiveness; chronic obstructive pulmonary disease (COPD); bronchitis including infectious and eosinophilic bronchitis; emphysema; bronchiectasis; cystic fibrosis; sarcoidosis; farmer's lung and related diseases; hypersensitivity pneumonitis; lung fibrosis including cryptogenic fibrosing alveolitis, idiopathic interstitial pneumonias, fibrosis complicating antineoplastic therapy and chronic infection, including tuberculosis and aspergillosis and other fungal infections; complications of lung transplantation; vasculitic and thrombotic disorders of the lung vasculature, and pulmonary hypertension; antitussive activity including treatment of chronic cough associated with inflammatory and secretory conditions of the airways, and iatrogenic cough; acute and chronic rhinitis including rhinitis medicamentosa, and vasomotor rhinitis; perennial and seasonal allergic rhinitis including rhinitis nervosa (hay fever); nasal polyposis; acute viral infection including the common cold, and infection due to respiratory syncytial virus, influenza, coronavirus (including SARS) and adenovirus.

(2) (Skin) psoriasis, atopic dermatitis, contact dermatitis or other eczematous dermatoses, and delayed-type hypersensitivity reactions; phyto- and photodermatitis; seborrhoeic dermatitis, dermatitis herpetiformis, lichen planus, lichen sclerosus et atrophica, pyoderma gangrenosum, skin sarcoid, discoid lupus erythematosus, pemphigus, pemphigoid, epidermolysis bullosa, urticaria, angioedema, vasculitides, toxic erythemas, cutaneous eosinophilias, alopecia greata, male-pattern baldness, Sweet's syndrome, Weber-Christian syndrome, erythema multiforme; cellulitis, both infective and non-infective; panniculitis; cutaneous lymphomas, non-melanoma skin cancer and other dysplastic lesions; drug-induced disorders including fixed drug eruptions.

(3) (Eyes) blepharitis; conjunctivitis, including perennial and vernal allergic conjunctivitis; iritis; anterior and posterior uveitis; choroiditis; autoimmune; degenerative or inflammatory disorders affecting the retina; ophthalmitis including sympathetic ophthalmitis; sarcoidosis; infections including viral, fungal, and bacterial.

(4) (Genitourinary) nephritis including interstitial and glomerulonephritis; nephrotic syndrome; cystitis including acute and chronic (interstitial) cystitis and Hunner's ulcer; acute and chronic urethritis, prostatitis, epididymitis, oophoritis and salpingitis; vulvo-vaginitis; Peyronie's disease; erectile dysfunction (both male and female).

(5) (Allograft rejection) acute and chronic following, for example, transplantation of kidney, heart, liver, lung, bone marrow, skin or cornea or following blood transfusion; or chronic graft versus host disease.

(6) Other auto-immune and allergic disorders including rheumatoid arthritis, irritable bowel syndrome, systemic lupus erythematosus, multiple sclerosis, Hashimoto's thyroiditis, Graves' disease, Addison's disease, diabetes mellitus, idiopathic thrombocytopaenic purpura, eosinophilic fasciitis, hyper-IgE syndrome, antiphospholipid syndrome, Sazary syndrome.

(7) (Oncology) treatment of common cancers including prostate, breast, lung, ovarian, pancreatic, bowel and colon, stomach, skin and brain tumors and malignancies affecting the bone marrow (including the leukaemias) and lymphoproliferative systems, such as Hodgkin's and non-Hodgkin's lymphoma; including the prevention and treatment of metastatic disease and tumor recurrences, and paraneoplastic syndromes.

(8) (Infectious diseases) virus diseases such as genital warts, common warts, plantar warts, hepatitis B, hepatitis C, herpes simplex virus, molluscum contagiosum, variola, HIV, CMV, VZV, rhinovirus, adenovirus, coronavirus, influenza, para-influenza; bacterial diseases such as tuberculosis and mycobacterium avium, leprosy; other infectious diseases, such as fungal diseases, chlamydia, candida, aspergillus, cryptococcal meningitis, pneumocystis carnii, cryptosporidiosis, histoplasmosis, toxoplasmosis, trypanosome infection, leishmaniasis.

The 8-oxoadenine compounds or pharmaceutically acceptable salt thereof can also be used as vaccine adjuvant.

The 8-oxoadenine compound of the present invention, or its pharmaceutically acceptable salt shows an interferon inducing activity and/or a suppressing activity of the production of IL-4 and IL-5, and thus shows an effect as a medicament having an immunomodulating activity specific against type 1 helper T-cell (Th1 cell)/type 2 helper T-cell (Th2 cell), namely, preferably useful as a prophylactic or therapeutic agent for asthma caused by Th2 cell, and allergic diseases such as allergic rhinitis, allergic conjunctivitis and atopic dermatosis. Additionally, due to its an immuno activating activity such as interferon α and interferon γ inducing activity, it is useful as a prophylactic or therapeutic agent for cancer, a viral disease caused by infection with virus such as hepatitis B virus, hepatitis C virus, HIV and human papilloma virus (HPV), infections by bacteria and dermatosis such as psoriasis.

The compound of the present invention has no limitation as to its administration formulation and is administered orally or parenterally. The preparation for oral administration can be exemplified by capsules, powders, tablets, granules, fine-grain, syrups, solutions, suspensions, etc., and the preparation for parenteral administration can be exemplified by injections, drips, eye-drops, intrarectal preparations, inhalations, sprays (e.g. sprays, aerosols, liquids/suspensions for cartridge spray for inhalators or insufflators), lotions, gels, ointments, creams, transdermal preparations, transmucosa preparations, collunariums, ear drops, tapes, transdermal patches, cataplasms, powders for external application, and the like. Those preparations can be prepared by so-far known manners, and acceptable conventional carriers, fillers, binders, lubricants, stabilizers, disintegrants, buffering agents, solubilizing agents, isotonic agents, surfactants, antiseptics, perfumes, and so on can be used. Two or more pharmaceutical carriers can be appropriately used.

A liquid preparation such as emulsions and syrups, among the preparations for oral administration, can be prepared by using additives including water; a sugar such as sucrose, sorbitol and fructose; a glycol such as polyethylene glycol and propylene glycol; an oil such as sesame oil, olive oil and soybean oil; an antiseptic such as p-hydroxybenzoic acid ester; a flavor such as strawberry flavor and peppermint flavor. The solid preparation such as capsules, tablets, powders and granules can be prepared by using a filler such as lactose, glucose, sucrose and mannitol; a disintegrant such as starch and sodium alginate; a lubricant such as magnesium stearate and talc; a binder such as polyvinyl alcohol, hydroxypropyl cellulose and gelatin; a surfactant such as a fatty acid ester; a plasticizer such as glycerin.

The liquid preparation such as injections, drips, eye-drops and ear drops, among the preparations for parenteral administration, can be prepared preferably as a sterilized isotonic liquid preparation. For instance, injections can be prepared by using an aqueous medium such as a salt solution, a glucose solution or a mixture of a salt solution and a glucose solution. The preparation for intrarectal administration can be prepared by using a carrier such as cacao butter usually in the form of suppository.

The ointments, creams and gels contain the compound of the present invention usually in an amount of 0.01-10 w/w %, and there may be incorporated a thickening agent suitable to an aqueous or oily base and/or a gelling agent and/or a solvent. The base is exemplified by water and/or oil such as liquid paraffin, a vegetable oil such as arachis oil and castor oil, a solvent such as polyethylene glycol, and so on. The thickening agent and gelling agent are exemplified by soft paraffin, aluminum stearate, cetostearic alcohol, polyethylene glycol, sheep fat, beeswax, carboxypolymethylene and cellulose derivatives and/or glyceryl monostearate and/or nonionic emulsifiers.

The lotions contain the compound of the present invention usually in an amount of 0.01-10 w/w %, and it may be prepared with the use of an aqueous or oily base, it may contain generally emulsifiers, stabilizers, dispersing agents, precipitation inhibitors and also thickening agents.

Powders for external use contain the compound of the present invention usually an amount of 0.01-10 w/w %, and it may be formulated using a suitable powdery base such as talc, lactose and starch.

The drips may be formulated by using an aqueous or non-aqueous base, and may contain dispersing agents, solubilizing agents, precipitation inhibitors or antiseptics.

The sprays may be formulated into an aqueous solution or suspension using a suitable liquid propellant, or into an aerosol distributed from a pressured package such as a metered-dose inhaler.

The aerosols suitable to inhalation may be a suspension or aqueous solution, and they contain generally the compound of the present invention and a suitable propellant such as fluorocarbon, hydrogen-containing chlorofluorocarbon and a mixture thereof, particularly hydrofluoroalkane, specifically 1,1,1,2-tetrafluoroethane, 1,1,1,2,3,3,3-heptafluoro-n-propane or a mixture thereof. The aerosols may contain optionally additional excipients well known in the art such as a surfactant, (e.g., oleic acid or lecitin) and a co-solvent such as ethanol.

The gelatin capsules or cartridges used for inhalator or insufflator may be formulated by using a powdery mixture of the compounds used in the present invention and a powdery base such as lactose and starch. They contain the compound of the present invention usually in an amount of 20 μg-10 mg. The compound of the present invention may be administered without using excipients such as lactose as an alternative method.

The 8-oxoadenine compound of the present invention is preferably parenterally administered as a preparation for topical administration. The suitable preparation is exemplified by ointments, lotions, creams, gels, tapes, transdermal patches, cataplasms, sprays, aerosols, aqueous solutions/suspensions for cartridge spray for inhalators or insufflators, eye-drops, ear drops, nasal drops, powders for external administrations and so on.

A ratio of the active compound of the present invention in the preparation for topical administration of the present invention is, though depending upon the formulation, generally 0.001-10 wt %, preferably 0.005-1%. The ratio used in powders for inhalation or insufflation is 0.1-5%.

In a case of aerosols, the compound of the present invention is preferably contained in an amount of 20-2000 μg, more preferably about 20 μg-500 μg per each a measured amount or one sprayed amount. The dosage is once or several times per day, for instance, 2, 3, 4 or 8 times, and one to three units are administered per each time.

The 8-oxoadenine compound of the present invention, preferably the compound (I) wherein R² is except hydrogen atom, its tautomer or its pharmaceutically acceptable salt can show the pharmaceutical activity at the site administered in a case of topical administration, and further they are useful as a pharmaceutical preparation for topical administration characterized by showing no systemic pharmacological activity because the compounds are converted by an enzyme in vivo into different compounds (degraded compounds) having only a substantially reduced medical effect. The medical effect used here means a pharmacological activity of the compound, including specifically an interferon inducing activity, and a suppressing activity of the production IL-4 and/or IL-5.

The medical effect of the degraded compound is preferably 10 times, more preferably 100 times, still more preferably 1000 times reduced comparing with that of the parent compound.

The pharmacological activity can be measured by any of conventional evaluation methods, preferably by an in vitro evaluation method. Specific examples of the methods are one described in Method in ENZYMOLOGY (Academic Press), a method using commercially available ELISA kits (e.g. AN'ALYSA (immunoassay System)) and a method described in examples of the present specification.

For instance, by measuring interferon inducing activity with bioassay using cells of mouse spleen, the amount of each interferon induction (IU/ml at the same concentration of the parent compound (the compound of the present invention) and the degraded compound can be compared.

As the pharmacological activity, the activity in vivo caused by interferon inducing activity, etc. is illustrated. Said activity in vivo includes immune activating activity, influenza-like symptom, etc. The immune activating activity includes induction of cytotoxic activity such as natural killer (NK) cells, etc. The influenza-like symptom includes fever, etc. The fever means elevation in body temperature of a mammalian, for example, in a case of human, the fever means that the body temperature increases more than normal temperature.

The topical administration is not limited as to the administration method, and the administration is conducted in a case of administration via nasal cavity, alveolus or air way, by aeration or inhalation, in a case of administration to skin, by spreading on the skins, and in a case of administration to eye, by eye dropping, etc. Preferable administration is aeration and inhalation.

It can be confirmed that when the pharmaceutical composition for topical administration of the present invention is administered topically, the compound of the present invention therein is converted to a degraded compound in the blood, etc. in human or animal for example, by its half life in the serum or in lever S9 in vitro. The test method to determine the half life of the compound of the present invention in vitro is known.

In the vitro measuring test, the compound of the present invention is metabolized in liver S9 and its half life is preferably not longer than 60 minutes, more preferably not longer than 30 minutes, and still more preferably not longer than 10 minutes.

Further, the compound of the present invention is metabolized in serum, and its half life is preferably not longer than 60 minutes, more preferably not longer than 30 minutes, and still more preferably not longer than 10 minutes.

As the degraded compound, the compound of the formula (1) wherein R² is a hydrogen atom is exemplified, when the parent compound is the compound of the formula (1) wherein R² is a group except hydrogen atom.

The method for measuring the half life in liver S9 is as follows. Namely, the compound of the present invention is added to a liver S9 solution and incubated at 37±0.5° C. for 5 minutes to 2 hours. By quantitative analyzing at the definite interval the amount of the compound of the present invention remaining in the lever S9 solution with HPLC (high performance liquid chromatography), etc., the constant of quenching velocity calculated and the half life is calculated. The specific method is described in the Example.

The liver S9 solution used here means product obtained by homogenizing a liver of a mammal in an aqueous solution such as a physiological saline solution, a sucrose solution and a KCl solution and then by recovering the supernatant upon centrifugation at 9000×g. The aqueous solution is used usually in an amount of 2 to 4 times as much as the liver. The mammal includes human, dog, rabbit, guinea pig, mouse and rat. The liver S9 can be used optionally after dilution with a buffering solution.

The measuring method for the half life in serum of the present invention is as follows. Namely, the compound of the present invention is a serum solution and incubated at 37±0.5° C. for 5 minutes to 2 hours. By quantitative analyzing at the definite interval the amount of the compound of the present invention remaining in the serum solution with HPLC (high performance liquid chromatograph), etc., the constant of quenching velocity calculated and the half life is calculated.

The serum used here means a supernatant fraction obtained by leaving hemocytes and blood coagulation factor from blood by centrifugation, etc. and it may be used after dilution with a buffering solution.

The invention further relates to combination therapies wherein a compound of formula (1) or a pharmaceutically acceptable salt or a pharmaceutical composition or formulation comprising a compound of formula (1) is administered concurrently or sequentially or as a combined preparation with another therapeutic agent or agents, for the treatment of one or more of the conditions listed.

In particular, for the treatment of the inflammatory diseases, COPD, asthma and allergic rhinitis, the compounds of the invention may be combined with agents such as tumour necrosis factor alpha (TNF-a ) inhibitors such as anti-TNF monoclonal antibodies (for example Remicade, CDP-870 and adalimumab) and TNF receptor immunoglobulin molecules (such as Enbrel); non-selective cyclo-oxygenase (COX)-1/COX-2 inhibitors whether applied topically or systemically (such as piroxicam, diclofenac, propionic acids such as naproxen, flubiprofen, fenoprofen, ketoprofen and ibuprofen, fenamates such as mefenamic acid, indomethacin, sulindac, azapropazone, pyrazolones such as phenylbutazone, salicylates such as aspirin), COX-2 inhibitors (such as meloxicam, celecoxib, rofecoxib, valdecoxib, lumarocoxib, parecoxib and etoricoxib); glucocortico steroids (whether administered by topical, oral, intramuscular, intravenous, or intra-articular routes); methotrexate, lefunomide; hydroxychloroquine, d-penicillamine, auranofin or other parenteral or oral gold preparations.

The present invention still further relates to combination therapies of a compound of the invention together with a leukotriene biosynthesis inhibitor, 5-lipoxygenase (5-LO) inhibitor or 5-lipoxygenase activating protein (FLAP) antagonist such as; zileuton; ABT-761; fenleuton; tepoxalin; Abbott-79175; Abbott-85761; N-(5-substituted)-thiophene-2-alkylsulfonamides; 2,6-di-tert-butylphenol hydrazones; methoxytetrahydropyrans such as Zeneca ZD-2138; the compound SB-210661; pyridinyl-substituted 2-cyanonaphthalene compounds such as L-739,010; 2-cyanoquinoline compounds such as L-746,530; indole and quinoline compounds such as MK-591, MK-886, and BAY×1005.

The present invention still further relates to combination therapies of a compound of the invention together with a receptor antagonist for leukotrienes (LT) B4, LTC4, LTD4, and LTE4 selected from the group consisting of phenothiazin compound such as L-651,392; amidino compounds such as CGS-25019; benzoxalamines such as ontazolast; benzenecarboximidamides such as BIIL 284/260; and compounds such as zafirlukast, ablukast, montelukast, pranlukast, verlukast (MK-679), RG-12525, Ro-245913, iralukast (CGP 45715A), and BAY×7195.

The present invention still further relates to combination therapies of a compound of the invention together with a phosphodiesterase (PDE) inhibitor such as the methylxanthanines including theophylline and aminophylline; and selective PDE isoenzyme inhibitors including PDE4 inhibitors and inhibitors of isoform PDE4D, and inhibitors of PDE5.

The present invention still further relates to combination therapies of a compound of the invention together with histamine type 1 receptor antagonists such as cetirizine, loratadine, desloratadine, fexofenadine, acrivastine, terfenadine, astemizole, azelastine, levocabastine, chlorpheniramine, promethazine, cyclizine, and mizolastine, which is applied orally, topically or parenterally.

The present invention still further relates to combination therapies of a compound of the invention together with a gastroprotective histamine type 2 receptor antagonist.

The present invention still further relates to combination therapies of a compound of the invention with antagonists of the histamine type 4 receptor.

The present invention still further relates to combination therapies of a compound of the invention together with an alpha-1/alpha-2 adrenoceptor agonist, vasoconstrictor sympathomimetic agent, such as propylhexedrine, phenylephrine, phenylpropanolamine, ephedrine, pseudoephedrine, naphazoline hydrochloride, oxymetazoline hydrochloride, tetrahydrozoline hydrochloride, xylometazoline hydrochloride, tramazoline hydrochloride, and ethylnorepinephrine hydrochloride.

The present invention still further relates to combination therapies of a compound of the invention together with anticholinergic agents including muscarinic receptor (M1, M2 and M3) antagonists such as atropine, hyoscine, glycopyrrolate, ipratropium bromide; tiotropium bromide; oxitropium bromide; pirenzepine; and telenzepine.

The present invention still further relates to combination therapies of a compound of the invention together with a beta-adrenoceptor agonist (including beta receptor subtypes 1-4) such as isoprenaline, salbutamol, formoterol, salmeterol, terbutaline, orciprenaline, bitolterol mesylate, and pirbuterol.

The present invention still further relates to combination therapies of a compound of the invention together with a chromone, including sodium cromoglycate and nedocromil sodium.

The present invention still further relates to combination therapies of a compound of the invention together with an insulin-like growth factor type I (IGF-1) mimetic.

The present invention still further relates to combination therapies of a compound of the invention together with an inhaled glucocorticoid, such as flunisolide, triamcinolone acetonide, beclomethasone dipropionate, budesonide, fluticasone propionate, ciclesonide, and mometasone furoate.

The present invention still further relates to combination therapies of a compound of the invention together with an inhibitor of matrix metalloproteases (MMPs), i.e., stromelysin, collagenase, gelatinase, aggrecanase; especially collagenase-1 (MMP-1), collagenase-2 (MMP-8), collagenase-3 (MMP-13), stromelysin-1 (MMP-3), stromelysin-2 (MMP-10), stromelysin-3 (MMP-11), MMP-9 and MMP-12.

The present invention still further relates to combination therapies of a compound of the invention together with modulators of chemokine receptor function such as antagonists of CCR1, CCR2, CCR2A, CCR2B, CCR3, CCR4, CCR5, CCR6, CCR7, CCR8, CCR9, CCR10 and CCR11 (for the C—C family); CXCR1, CXCR2, CXCR3, CXCR4 and CXCR5 (for the C—X—C family) and CX3CR1 (for the C—X3-C family).

The present invention still further relates to combination therapies of a compound of the invention together with a cytokine or a modulator of cytokine function including agents which act on cytokine signalling pathways, such as alpha-, beta-, and gamma-interferon; interleukins (IL) including IL1 to 15, and interleukin antagonists or inhibitors.

The present invention still further relates to combination therapies of a compound of the invention together with an immunoglobulin (Ig), an Ig preparation, or an antagonist or antibody modulating Ig function such as anti-IgE (omalizumab).

The present invention still further relates to combination therapies of a compound of the invention together with thalidomide and derivatives, or systemic or topically-applied anti-inflammatory agents such as retinoids, dithranol, and calcipotriol.

The present invention still further relates to combination therapies of a compound of the invention together with an antibacterial agent including penicillin derivatives, tetracyclines, macrolides, beta-lactams, fluoroquinolones, and inhaled aminoglycosides; and antiviral agents including acyclovir, famciclovir, valaciclovir, ganciclovir, cidofovir, amantadine, rimantadine, ribavirin; zanamavirand oseltamavir; protease inhibitors such as indinavir, nelfinavir, ritonavir, and saquinavir; nucleoside reverse transcriptase inhibitors such as didanosine, lamivudine, stavudine, zalcitabine and zidovudine; non-nucleoside reverse transcriptase inhibitors such as nevirapine and efavirenz.

The present invention still further relates to combination therapies of a compound of the invention together with agents used for treatment of cancer. Suitable agents to be used in the combination therapies include:

-   (i) antiproliferative/antineoplastic drugs and combinations thereof,     which are used as an anticancer agent, such as alkylating agents     (for example cis platin, carboplatin, cyclophosphamide, nitrogen     mustard, melphalan, chlorambucil, busulphan and nitrosoureas);     antimetabolites (for example fluoropyrimidines like 5-fluorouracil     and tegafur, antifolates such as raltitrexed, methotrexate, cytosine     arabinoside, hydroxyurea, gemcitabine and paclitaxel; antitumour     antibiotics (for example anthracyclines like adriamycin, bleomycin,     doxorubicin, daunomycin, epirubicin, idarubicin, mitomycin-C,     dactinomycin and mithramycin); antimitotic agents (for example vinca     alkaloids like vincristine, vinblastine, vindesine and vinorelbine     and taxoids like taxol and taxotere); and topoisomerase inhibitors     (for example epipodophyllotoxins like etoposide and teniposide,     amsacrine, topotecan and camptothecins); -   (ii) cytostatic agents such as antioestrogens (for example     tamoxifen, toremifene, raloxifene, droloxifene and iodoxyfene),     oestrogen receptor down regulators (for example fulvestrant),     antiandrogens (for example bicalutamide, flutamide, nilutamide and     cyproterone acetate), LHRH antagonists or LHRH agonists (for example     goserelin, leuprorelin and buserelin), progestogens (for example     megestrol acetate), aromatase inhibitors (for example as     anastrozole, letrozole, vorazole and exemestane) and inhibitors of     5α-reductase such as finasteride; -   (iii) agents which inhibit cancer cell invasion (for example     metalloproteinase inhibitors like marimastat and inhibitors of     urokinase plasminogen activator receptor function); -   (iv) inhibitors of growth factor function, for example such     inhibitors include growth factor antibodies, growth factor receptor     antibodies (for example the anti erbb2 antibody trastuzumab and the     anti erbb1 antibody cetuximab [C225]), farnesyl transferase     inhibitors, tyrosine kinase inhibitors and serine/threonine kinase     inhibitors, for example inhibitors of the epidermal growth factor     family (for example EGFR family tyrosine kinase inhibitors such as     N-(3-chloro-4-fluorophenyl)-7-methoxy-6-(3-morpholinopropoxy)quinazolin-4-amine     (gefitinib, AZD1839),     N-(3-ethynylphenyl)-6,7-bis(2-methoxy-ethoxy)quinazolin-4-amine     (erlotinib, OSI 774) and     6-acrylamido-N-(3-chloro-4-fluorophenyl)-7-(3-morpholinopropoxy)quinazolin-4-amine     (CI 1033)), for example inhibitors of the platelet-derived growth     factor family and for example inhibitors of the hepatocyte growth     factor family; -   (v) antiangiogenic agents such as those which inhibit the effects of     vascular endothelial growth factor, (for example the anti vascular     endothelial cell growth factor antibody bevacizumab, compounds     disclosed in WO 97/22596, WO 97/30035, WO 97/32856 and WO 98/13354)     and compounds that work by other mechanisms (for example linomide,     inhibitors of integrin αvβ3 function and angiostatin); -   (vi) vascular damaging agents such as combretastatin A4 and     compounds disclosed in WO 99/02166, WO00/40529, WO 00/41669, WO     01/92224, WO 02/04434 and WO 02/08213; -   (vii) antisense therapies, for example those which are directed to     the targets listed above, such as ISIS 2503, an anti-ras antisense; -   (viii) gene therapy approaches, including for example approaches to     replace aberrant genes such as aberrant p53 or aberrant BRCA1 or     BRCA2, GDEPT (gene directed enzyme pro drug therapy) approaches such     as those using cytosine deaminase, thymidine kinase or a bacterial     nitroreductase enzyme and approaches to increase patient tolerance     to chemotherapy or radiotherapy such as multi drug resistance gene     therapy; and -   (ix) immunotherapy approaches, including for example ex vivo and in     vivo approaches to increase the immunogenicity of patient tumour     cells, such as transfection with cytokines such as interleukin 2,     interleukin 4 or granulocyte macrophage colony stimulating factor,     approaches to decrease T cell anergy, approaches using transfected     immune cells such as cytokine transfected dendritic cells,     approaches using cytokine transfected tumour cell lines and     approaches using anti idiotypic antibodies.

The compounds of the present invention are illustrated in the following Tables 1 to 29, but should not be limited to these compounds. In these Tables, the compounds of the present invention are shown in a form of 8-hydroxy type for convenience and it is not different from 8-oxo type.

TABLE 1

—L¹— —(CH₂)₃O— —(CH₂)₄O— —(CH₂)₂OCH₂— —(CH₂)₂O(CH₂)₂— —(CH₂)₃OCH₂— —(CH₂)₂S— —(CH₂)₃S— —(CH₂)₄S— —(CH₂)₂SCH₂— —(CH₂)₂S(CH₂)₂— —(CH₂)₃SCH₂— —(CH₂)₂SO₂— —(CH₂)₃SO₂— —(CH₂)₂NH— —(CH₂)₃NH— —(CH₂)₄NH— —(CH₂)₂NHCH₂— —(CH₂)₂NH(CH₂)₂— —(CH₂)₃NHCH₂— —(CH₂)₂N(CH₃)— —(CH₂)₃N(CH₃)— —(CH₂)₄N(CH₃)— —(CH₂)₂N(CH₃)CH₂— —(CH₂)₃N(CH₃)CH₂— —(CH₂)₂NHCO— —(CH₂)₃NHCO— —(CH₂)₂NHSO₂(CH₂)₂— —(CH₂)₃NHSO₂CH₂— —(CH₂)₂NCH₃SO₂CH₂— —(CH₂)₂NHCONH— —(CH₂)₃NHCONH— —(CH₂)₂NHCSNH— —(CH₂)₃NHCSNH— —(CH₂)₄NHCSNH— —CH₂CO— —(CH₂)₂CO— —(CH₂)₃CO— —(CH₂)₄CO— —CH₂COCH₂—

TABLE 2

—L¹— —(CH₂)₄SO₂— —(CH₂)₂SO₂CH₂— —(CH₂)₂SO₂(CH₂)₂— —(CH₂)₃SO₂CH₂— —(CH₂)₂SO₂NH— —(CH₂)₃SO₂NH— —(CH₂)₄SO₂NH— —(CH₂)₂SO₂NHCH₂— —(CH₂)₂SO₂NH(CH₂)₂— —(CH₂)₃SO₂NHCH₂— —(CH₂)₂SO₂N(CH₃)— —(CH₂)₃SO₂N(CH₃)— —(CH₂)₂SO₂N(CH₃)CH₂— —(CH₂)₃SO₂N(CH₃)CH₂— —(CH₂)₄NHCO— —(CH₂)₂NHCOCH₂— —(CH₂)₃NHCOCH₂— —(CH₂)₂N(CH₃)CO— —(CH₂)₃N(CH₃)CO— —(CH₂)₄N(CH₃)CO— —(CH₂)₃N(CH₃)COCH₂— —(CH₂)₂NHCO₂CH₂— —(CH₂)₂NHSO₂— —(CH₂)₃NHSO₂— —(CH₂)₂N(CH₃)SO₂— —(CH₂)₃N(CH₃)SO₂— —(CH₂)₄N(CH₃)SO₂— —(CH₂)₂NHSO₂CH₂— —CH₂CO(CH₂)₂— —(CH₂)₂COCH₂— —(CH₂)₂CO(CH₂)₂— —CH₂CONH— —(CH₂)₂CONH— —(CH₂)₃CONH— —CH₂CONHCH₂— —(CH₂)₂CONHCH₂— —CH₂CON(CH₃)— —(CH₂)₂CON(CH₃)— —(CH₂)₃CON(CH₃)— —CH₂CON(CH₃)CH₂— —CH₂CON(CH₃)(CH₂)₂— —(CH₂)₂CON(CH₃)CH₂—

TABLE 3

—L¹— —(CH₂)₂O— —(CH₂)₃O— —(CH₂)₄O— —(CH₂)₂OCH₂— —(CH₂)₂O(CH₂)₂— —(CH₂)₃OCH₂— —(CH₂)₂S— —(CH₂)₃S— —(CH₂)₄S— —(CH₂)₂SCH₂— —(CH₂)₂S(CH₂)₂— —(CH₂)₃SCH₂— —(CH₂)₂SO₂— —(CH₂)₂NH— —(CH₂)₃NH— —(CH₂)₄NH— —(CH₂)₂NHCH₂— —(CH₂)₂NH(CH₂)₂— —(CH₂)₃NHCH₂— —(CH₂)₂N(CH₃)— —(CH₂)₃N(CH₃)— —(CH₂)₄N(CH₃)— —(CH₂)₂N(CH₃)CH₂— —(CH₂)₃N(CH₃)CH₂— —(CH₂)₂NHCO— —(CH₂)₃NHCO— —(CH₂)₄N(CH₃)SO₂— —(CH₂)₂N(CH₃)SO₂CH₂— —(CH₂)₂NHCONH— —(CH₂)₃NHCONH— —(CH₂)₂NHCSNH— —(CH₂)₃NHCSNH— —(CH₂)₄NHCSNH— —CH₂CO— —(CH₂)₂CO— —(CH₂)₃CO— —(CH₂)₄CO— —CH₂COCH₂— —CH₂CO(CH₂)₂—

TABLE 4

—L¹— —(CH₂)₃SO₂— —(CH₂)₄SO₂— —(CH₂)₂SO₂CH₂— —(CH₂)₂SO₂(CH₂)₂— —(CH₂)₃SO₂CH₂— —(CH₂)₂SO₂NH— —(CH₂)₃SO₂NH— —(CH₂)₄SO₂NH— —(CH₂)₂SO₂NHCH₂— —(CH₂)₂SO₂NH(CH₂)₂— —(CH₂)₃SO₂NHCH₂— —(CH₂)₂SO₂N(CH₃)— —(CH₂)₃SO₂N(CH₃)— —(CH₂)₄SO₂N(CH₃)— —(CH₂)₂SO₂N(CH₃)CH₂— —(CH₂)₃SO₂N(CH₃)CH₂— —(CH₂)₄NHCO— —(CH₂)₂NHCOCH₂— —(CH₂)₃NHCOCH₂— —(CH₂)₂N(CH₃)CO— —(CH₂)₃N(CH₃)CO— —(CH₂)₄N(CH₃)CO— —(CH₂)₃N(CH₃)COCH₂— —(CH₂)₂NHCO₂CH₂— —(CH₂)₂NHSO₂— —(CH₂)₃NHSO₂— —(CH₂)₄NHSO₂— —(CH₂)₂NHSO₂CH₂— —(CH₂)₂NHSO₂(CH₂)₂— —(CH₂)₃NHSO₂CH₂— —(CH₂)₂N(CH₃)SO₂— —(CH₂)₃N(CH₃)SO₂— —(CH₂)₂COCH₂— —CH₂CONH— —(CH₂)₂CONH— —(CH₂)₃CONH— —CH₂CONHCH₂— —(CH₂)₂CONHCH₂— —CH₂CON(CH₃)— —(CH₂)₂CON(CH₃)— —(CH₂)₃CON(CH₃)— —CH₂CON(CH₃)CH₂— —CH₂CON(CH₃)(CH₂)₂— —(CH₂)₂CON(CH₃)CH₂—

TABLE 5

—R¹⁰ —O(CH₂)₂CH₃ —O(CH₂)₄CH₃ —O(CH₂)₂OH —O(CH₂)₃OH —O(CH₂)₂OCH₃ —O(CH₂)₂OCH₂CH₃ —O(CH₂)₃OCH₃ —O(CH₂)₃CF₃

—S(CH₂)₂CH₃ —S(CH₂)₃CH₃ —S(CH₂)₂OH —S(CH₂)₃OH —S(CH₂)₄OH —S(CH₂)₂OCH₃ —S(CH₂)₂OCH₂CH₃ —S(CH₂)₃OCH₃ —(CH₂)₃CH₃ —(CH₂)₂CO₂CH₃ —NH(CH₂)₂CH₃ —NH(CH₂)₃CH₃ —NH(CH₂)₂OCH₃ —NH(CH₂)₃OCH₃ —NCH₃(CH₂)₂CH₃ —NCH₃(CH₂)₃CH₃ —NCH₃(CH₂)₂OCH₃ —NCH₃(CH₂)₃OCH₃

TABLE 6

—R¹⁰ —O(CH₂)₂CH₃ —O(CH₂)₄CH₃ —O(CH₂)₂OH —O(CH₂)₃OH —O(CH₂)₂OCH₃ —O(CH₂)₂OCH₂CH₃ —O(CH₂)₃OCH₃ —O(CH₂)₃CF₃

—S(CH₂)₂CH₃ —S(CH₂)₃CH₃ —S(CH₂)₂OH —S(CH₂)₃OH —S(CH₂)₄OH —S(CH₂)₂OCH₃ —S(CH₂)₂OCH₂CH₃ —S(CH₂)₃OCH₃ —(CH₂)₃CH₃ —(CH₂)₂CO₂CH₃ —NH(CH₂)₂CH₃ —NH(CH₂)₃CH₃ —NH(CH₂)₂OCH₃ —NH(CH₂)₃OCH₃ —NCH₃(CH₂)₂CH₃ —NCH₃(CH₂)₃CH₃ —NCH₃(CH₂)₂OCH₃ —NCH₃(CH₂)₃OCH₃

TABLE 7

—R¹⁰ —O(CH₂)₂CH₃ —O(CH₂)₃CH₃ —O(CH₂)₂OH —O(CH₂)₃OH —O(CH₂)₂OCH₃ —O(CH₂)₂OCH₂CH₃ —O(CH₂)₃OCH₃ —O(CH₂)₃CF₃

—S(CH₂)₂CH₃ —S(CH₂)₃CH₃ —S(CH₂)₂OH —S(CH₂)₃OH —S(CH₂)₄OH —S(CH₂)₂OCH₃ —S(CH₂)₂OCH₂CH₃ —S(CH₂)₃OCH₃ —(CH₂)₃CH₃ —(CH₂)₂CO₂CH₃ —NH(CH₂)₂CH₃ —NH(CH₂)₃CH₃ —NH(CH₂)₂OCH₃ —NH(CH₂)₃OCH₃ —NCH₃(CH₂)₂CH₃ —NCH₃(CH₂)₃CH₃ —NCH₃(CH₂)₂OCH₃ —NCH₃(CH₂)₃OCH₃

TABLE 8

—R¹⁰ —O(CH₂)₂CH₃ —O(CH₂)₃CH₃ —O(CH₂)₂OH —O(CH₂)₃OH —O(CH₂)₂OCH₃ —O(CH₂)₂OCH₂CH₃ —O(CH₂)₃OCH₃ —O(CH₂)₃CF₃

—S(CH₂)₂CH₃ —S(CH₂)₃CH₃ —S(CH₂)₂OH —S(CH₂)₃OH —S(CH₂)₄OH —S(CH₂)₂OCH₃ —S(CH₂)₂OCH₂CH₃ —S(CH₂)₃OCH₃ —(CH₂)₃CH₃ —(CH₂)₂CO₂CH₃ —NH(CH₂)₂CH₃ —NH(CH₂)₃CH₃ —NH(CH₂)₂OCH₃ —NH(CH₂)₃OCH₃ —NCH₃(CH₂)₂CH₃ —NCH₃(CH₂)₃CH₃ —NCH₃(CH₂)₂OCH₃ —NCH₃(CH₂)₃OCH₃

TABLE 9

—R¹⁰ —L¹— —O(CH₂)₂OCH₃ —(CH₂)₃O— —S(CH₂)₃CH₃ —(CH₂)₄O— —S(CH₂)₂OH —(CH₂)₂OCH₂— —(CH₂)₂CO₂CH₃ —(CH₂)₃OCH₂— —O(CH₂)₃CF₃ —(CH₂)₂S— —S(CH₂)₂OCH₃ —(CH₂)₃S— —NH(CH₂)₂OCH₃ —(CH₂)₄S— —NCH₃(CH₂)₂OCH₃ —(CH₂)₂SCH₂— —O(CH₂)₃OH —(CH₂)₂S(CH₂)₂— —S(CH₂)₃CF₃ —(CH₂)₃SCH₂—

—(CH₂)₂O(CH₂)₂— —(CH₂)₂CO₂CH₃ —(CH₂)₂SO₂—

TABLE 10

—R¹⁰ —L¹— —O(CH₂)₂OCH₃ —(CH₂)₃SO₂— —S(CH₂)₃CH₃ —(CH₂)₄SO₂— —S(CH₂)₂OH —(CH₂)₂SO₂CH₂— —(CH₂)₂CO₂CH₃ —(CH₂)₃SO₂CH₂— —O(CH₂)₃CF₃ —(CH₂)₂SO₂NH— —S(CH₂)₂OCH₃ —(CH₂)₃SO₂NH— —NH(CH₂)₂OCH₃ —(CH₂)₄SO₂NH— —NCH₃(CH₂)₂OCH₃ —(CH₂)₂SO₂NHCH₂— —O(CH₂)₃OH —(CH₂)₂SO₂NH(CH₂)₂— —S(CH₂)₃CF₃ —(CH₂)₃SO₂NHCH₂—

—(CH₂)₂SO₂(CH₂)₂— —(CH₂)₂CO₂CH₃ —(CH₂)₂SO₂NCH₃—

TABLE 11

—R¹⁰ —L¹— —O(CH₂)₂OCH₃ —(CH₂)₃SO₂NCH₃— —S(CH₂)₃CH₃ —(CH₂)₄SO₂NCH₃— —S(CH₂)₂OH —(CH₂)₂SO₂NCH₃CH₂— —(CH₂)₂CO₂CH₃ —(CH₂)₂NH— —O(CH₂)₃CF₃ —(CH₂)₃NH— —S(CH₂)₂OCH₃ —(CH₂)₄NH— —NH(CH₂)₂OCH₃ —(CH₂)₂NHCH₂— —NCH₃(CH₂)₂OCH₃ —(CH₂)₂NH(CH₂)₂— —O(CH₂)₃OH —(CH₂)₃NHCH₂— —S(CH₂)₃CF₃ —(CH₂)₂NCH₃—

—(CH₂)₃SO₂NHCH₂— —(CH₂)₂CO₂CH₃ —(CH₂)₃NCH₃—

TABLE 12

—R¹⁰ —L¹— —O(CH₂)₂OCH₃ —(CH₂)₄NCH₃— —S(CH₂)₃CH₃ —(CH₂)₂N(CH₃)CH₂— —S(CH₂)₂OH —(CH₂)₃N(CH₃)CH₂— —(CH₂)₂CO₂CH₃ —(CH₂)₃NHCO— —O(CH₂)₃CF₃ —(CH₂)₄NHCO— —S(CH₂)₂OCH₃ —(CH₂)₂NHCOCH₂— —NH(CH₂)₂OCH₃ —(CH₂)₃NHCOCH₂— —NCH₃(CH₂)₂OCH₃ —(CH₂)₂N(CH₃)CO— —O(CH₂)₃OH —(CH₂)₃N(CH₃)CO— —S(CH₂)₃CF₃ —(CH₂)₄N(CH₃)CO—

—(CH₂)₂NHCO— —(CH₂)₂CO₂CH₃ —(CH₂)₃N(CH₃)COCH₂—

TABLE 13

—R¹⁰ —L¹— —O(CH₂)₂OCH₃ —(CH₂)₂NCOOCH₂— —S(CH₂)₃CH₃ —(CH₂)₂NHSO₂— —S(CH₂)₂OH —(CH₂)₃NHSO₂— —(CH₂)₂CO₂CH₃ —(CH₂)₂NHSO₂(CH₂)₂— —O(CH₂)₃CF₃ —(CH₂)₂NHSO₂CH₂— —S(CH₂)₂OCH₃ —(CH₂)₂N(CH₃)SO₂— —NH(CH₂)₂OCH₃ —(CH₂)₃N(CH₃)SO₂— —NCH₃(CH₂)₂OCH₃ —(CH₂)₄N(CH₃)SO₂— —O(CH₂)₃OH —(CH₂)₂N(CH₃)SO₂CH₂— —S(CH₂)₃CF₃ —(CH₂)₂NHCONH—

—(CH₂)₂NHSO₂CH₂— —(CH₂)₂CO₂CH₃ —(CH₂)₃NHCONH—

TABLE 14

—R¹⁰ —L¹— —O(CH₂)₂OCH₃ —(CH₂)₂NHCSNH— —S(CH₂)₃CH₃ —(CH₂)₃NHCSNH— —S(CH₂)₂OH —(CH₂)₄NHCSNH— —(CH₂)₂CO₂CH₃ —(CH₂)₂CO— —O(CH₂)₃CF₃ —(CH₂)₃CO— —S(CH₂)₂OCH₃ —(CH₂)₄CO— —NH(CH₂)₂OCH₃ —CH₂COCH₂— —NCH₃(CH₂)₂OCH₃ —CH₂CO(CH₂)₂— —O(CH₂)₃OH —(CH₂)₂COCH₂— —S(CH₂)₃CF₃ —(CH₂)₂CO(CH₂)₂—

—CH₂CO— —(CH₂)₂CO₂CH₃ —CH₂CONH—

TABLE 15

—R¹⁰ —L¹— —O(CH₂)₂OCH₃ —(CH₂)₂CONH— —S(CH₂)₃CH₃ —(CH₂)₃CONH— —S(CH₂)₂OH —CH₂CONHCH₂— —(CH₂)₂CO₂CH₃ —(CH₂)₂CONHCH₂— —O(CH₂)₃CF₃ —CH₂CON(CH₃)— —S(CH₂)₂OCH₃ —(CH₂)₂CON(CH₃)— —NH(CH₂)₂OCH₃ —(CH₂)₃CON(CH₃)— —NCH₃(CH₂)₂OCH₃ —CH₂CON(CH₃)CH₂— —O(CH₂)₃OH —CH₂CON(CH₃)(CH₂)₂— —S(CH₂)₃CF₃ —(CH₂)₂CON(CH₃)CH₂—

—(CH₂)₃CONH—

TABLE 16

—R¹⁰ —L¹— —O(CH₂)₂OCH₃ —(CH₂)₃O— —S(CH₂)₃CH₃ —(CH₂)₄O— —S(CH₂)₂OH —(CH₂)₂OCH₂— —(CH₂)₂CO₂CH₃ —(CH₂)₃OCH₂— —O(CH₂)₃CF₃ —(CH₂)₂S— —S(CH₂)₂OCH₃ —(CH₂)₃S— —NH(CH₂)₂OCH₃ —(CH₂)₄S— —NCH₃(CH₂)₂OCH₃ —(CH₂)₂SCH₂— —O(CH₂)₃OH —(CH₂)₂S(CH₂)₂— —S(CH₂)₃CF₃ —(CH₂)₃SCH₂—

—(CH₂)₂O(CH₂)₂— —(CH₂)₂CO₂CH₃ —(CH₂)₂SO₂—

TABLE 17

—R¹⁰ —L¹— —O(CH₂)₂OCH₃ —(CH₂)₃SO₂— —S(CH₂)₃CH₃ —(CH₂)₄SO₂— —S(CH₂)₂OH —(CH₂)₂SO₂CH₂— —(CH₂)₂CO₂CH₃ —(CH₂)₃SO₂CH₂— —O(CH₂)₃CF₃ —(CH₂)₂SO₂NH— —S(CH₂)₂OCH₃ —(CH₂)₃SO₂NH— —NH(CH₂)₂OCH₃ —(CH₂)₄SO₂NH— —NCH₃(CH₂)₂OCH₃ —(CH₂)₂SO₂NHCH₂— —O(CH₂)₃OH —(CH₂)₂SO₂NH(CH₂)₂— —S(CH₂)₃CF₃ —(CH₂)₃SO₂NHCH₂—

—(CH₂)₂SO₂(CH₂)₂— —(CH₂)₂CO₂CH₃ —(CH₂)₂SO₂NCH₃—

TABLE 18

—R¹⁰ —L¹— —O(CH₂)₂OCH₃ —(CH₂)₃SO₂NCH₃— —S(CH₂)₃CH₃ —(CH₂)₄SO₂NCH₃— —S(CH₂)₂OH —(CH₂)₂SO₂NCH₃CH₂— —(CH₂)₂CO₂CH₃ —(CH₂)₂NH— —O(CH₂)₃CF₃ —(CH₂)₃NH— —S(CH₂)₂OCH₃ —(CH₂)₄NH— —NH(CH₂)₂OCH₃ —(CH₂)₂NHCH₂— —NCH₃(CH₂)₂OCH₃ —(CH₂)₂NH(CH₂)₂— —O(CH₂)₃OH —(CH₂)₃NHCH₂— —S(CH₂)₃CF₃ —(CH₂)₂NCH₃—

—(CH₂)₃SO₂NHCH₂— —(CH₂)₂CO₂CH₃ —(CH₂)₃NCH₃—

TABLE 19

—R¹⁰ —L¹— —O(CH₂)₂OCH₃ —(CH₂)₄NCH₃— —S(CH₂)₃CH₃ —(CH₂)₂N(CH₃)CH₂— —S(CH₂)₂OH —(CH₂)₃N(CH₃)CH₂— —(CH₂)₂CO₂CH₃ —(CH₂)₃NHCO— —O(CH₂)₃CF₃ —(CH₂)₄NHCO— —S(CH₂)₂OCH₃ —(CH₂)₂NHCOCH₂— —NH(CH₂)₂OCH₃ —(CH₂)₃NHCOCH₂— —NCH₃(CH₂)₂OCH₃ —(CH₂)₂N(CH₃)CO— —O(CH₂)₃OH —(CH₂)₃N(CH₃)CO— —S(CH₂)₃CF₃ —(CH₂)₄N(CH₃)CO—

—(CH₂)₂NHCO— —(CH₂)₂CO₂CH₃ —(CH₂)₃N(CH₃)COCH₂—

TABLE 20

—R¹⁰ —L¹— —O(CH₂)₂OCH₃ —(CH₂)₂NHCOOCH₂— —S(CH₂)₃CH₃ —(CH₂)₂NHSO₂— —S(CH₂)₂OH —(CH₂)₃NHSO₂— —(CH₂)₂CO₂CH₃ —(CH₂)₂NHSO₂(CH₂)₂— —O(CH₂)₃CF₃ —(CH₂)₃NHSO₂CH₂— —S(CH₂)₂OCH₃ —(CH₂)₂N(CH₃)SO₂— —NH(CH₂)₂OCH₃ —(CH₂)₃N(CH₃)SO₂— —NCH₃(CH₂)₂OCH₃ —(CH₂)₄N(CH₃)SO₂— —O(CH₂)₃OH —(CH₂)₂N(CH₃)SO₂CH₂— —S(CH₂)₃CF₃ —(CH₂)₂NHCONH—

—(CH₂)₂NHSO₂CH₂— —(CH₂)₂CO₂CH₃ —(CH₂)₃NHCONH—

TABLE 21

—R¹⁰ —L¹— —O(CH₂)₂OCH₃ —(CH₂)₂NHCSNH— —S(CH₂)₃CH₃ —(CH₂)₃NHCSNH— —S(CH₂)₂OH —(CH₂)₄NHCSNH— —(CH₂)₂CO₂CH₃ —(CH₂)₂CO— —O(CH₂)₃CF₃ —(CH₂)₃CO— —S(CH₂)₂OCH₃ —(CH₂)₄CO— —NH(CH₂)₂OCH₃ —CH₂OCH₂— —NCH₃(CH₂)₂OCH₃ —CH₂CO(CH₂)₂— —O(CH₂)₃OH —(CH₂)₂COCH₂— —S(CH₂)₃CF₃ —(CH₂)₂CO(CH₂)₂—

—CH₂CO— —(CH₂)₂CO₂CH₃ —CH₂CONH—

TABLE 22

—R¹⁰ —L¹— —O(CH₂)₂OCH₃ —(CH₂)₂CONH— —S(CH₂)₃CH₃ —(CH₂)₃CONH— —S(CH₂)₂OH —CH₂CONHCH₂— —(CH₂)₂CO₂CH₃ —(CH₂)₂CONHCH₂— —O(CH₂)₃CF₃ —CH₂CON(CH₃)— —S(CH₂)₂OCH₃ —(CH₂)₂CON(CH₃)— —NH(CH₂)₂OCH₃ —(CH₂)₃CON(CH₃)— —NCH₃(CH₂)₂OCH₃ —CH₂CON(CH₃)CH₂— —O(CH₂)₃OH —CH₂CON(CH₃)(CH₂)₂— —S(CH₂)₃CF₃ —(CH₂)₂CON(CH₃)CH₂—

—(CH₂)₃CONH—

TABLE 23

—R¹⁰ —R⁹ —O(CH₂)₃CH₃

—O(CH₂)₂OCH₃

—S(CH₂)₂OH

—(CH₂)₂CO₂CH₃

—O(CH₂)₃CH₃

—O(CH₂)₃CH₃

—O(CH₂)₂OCH₃

—S(CH₂)₂OH

—(CH₂)₂CO₂CH₃

—O(CH₂)₃CH₃

TABLE 24

—R¹⁰ —R⁹ —O(CH₂)₃CH₃

—O(CH₂)₂OCH₃

—S(CH₂)₂OH

—(CH₂)₂CO₂CH₃

—O(CH₂)₃CH₃

—O(CH₂)₃CH₃

—O(CH₂)₂OCH₃

—S(CH₂)₂OH

—(CH₂)₂CO₂CH₃

—O(CH₂)₃CH₃

TABLE 25

—R¹⁰ —R⁹ —O(CH₂)₃CH₃

—O(CH₂)₂OCH₃

—S(CH₂)₂OH

—(CH₂)₂CO₂CH₃

—O(CH₂)₃CH₃

—O(CH₂)₃CH₃

—O(CH₂)₂OCH₃

—S(CH₂)₂OH

—(CH₂)₂CO₂CH₃

—O(CH₂)₃CH₃

TABLE 26

—R¹⁰ —R⁹ —O(CH₂)₃CH₃

—O(CH₂)₂OCH₃

—S(CH₂)₂OH

—(CH₂)₂CO₂CH₃

—O(CH₂)₃CH₃

—O(CH₂)₃CH₃

—O(CH₂)₂OCH₃

—S(CH₂)₂OH

—(CH₂)₂CO₂CH₃

—O(CH₂)₃CH₃

TABLE 27

—R¹⁰ —R⁹ —O(CH₂)₃CH₃

—O(CH₂)₂OCH₃

—S(CH₂)₂OH

—(CH₂)₂CO₂CH₃

—O(CH₂)₃CH₃

—O(CH₂)₃CH₃

—O(CH₂)₂OCH₃

—S(CH₂)₂OH

—(CH₂)₂CO₂CH₃

—O(CH₂)₃CH₃

TABLE 28

—R¹⁰ —R⁹ —O(CH₂)₃CH₃

—O(CH₂)₂OCH₃

—S(CH₂)₂OH

—(CH₂)₂CO₂CH₃

—O(CH₂)₃CH₃

—O(CH₂)₃CH₃

—O(CH₂)₂OCH₃

—S(CH₂)₂OH

—(CH₂)₂CO₂CH₃

—O(CH₂)₃CH₃

TABLE 29

—R¹⁰ —R⁹ —O(CH₂)₃CH₃

—O(CH₂)₂OCH₃

—S(CH₂)₂OH

—(CH₂)₂CO₂CH₃

—O(CH₂)₃CH₃

—O(CH₂)₃CH₃

—O(CH₂)₂OCH₃

—S(CH₂)₂OH

—(CH₂)₂CO₂CH₃

—O(CH₂)₃CH₃

In the following, the present invention is further explained in details referring to Examples, Comparison Examples and Reference Examples, but the present invention is not limited thereto. In the following examples, chemical structures are for convenience shown in a form of 8-hydroxy type and it is not differentiated from 8-oxo type.

When otherwise stated, the organic solvent was dried over magnesium sulfate.

RPHPLC means preparative reverse phase HPLC using Waters Symmetry C8, Xterra or Gemini columns and using, as a mobile phase,

-   acetonitrile and either aqueous solution of ammonium acetate or -   ammonia or trifluoroacetic acid. The column chromatography was     conducted with the use of silica gel.

EXAMPLE 1 Synthesis of 2-butoxy-8-oxo-9-[2-(3-methoxycarbonylphenoxy)ethyl]adenine

To 2-butoxy-9-[2-(3-methoxycarbonylphenoxy)ethyl]adenine (400 mg, 1.04 mmol) in chloroform (10 mL) obtained in Reference Example 2 was added sodium acetate (283 mg, 1.56 mmol), and bromine (78 μl, 1.56 mmol) was dropped under ice-cooling thereto, and the mixture was stirred at room temperature for 3 hours. To the reaction mixture were added saturated sodium hydrogen carbonate (1 ml) and saturated sodium thiosulfate (2 ml) and stirred for 10 minutes. The reaction solution was diluted with water and extracted with chloroform (methanol 5%).

The organic layer was washed with water, saturated brine, dried over sodium sulfate and concentrated under reduced pressure. The residue was purified by silica gel chromatography to give a bromo compound. To the obtained bromo compound were added methanol (10 ml) and 2.5N sodium hydroxide (16 ml), and the mixture was stirred at 85° C. for 1.5 hours. The reaction mixture was diluted with water and acidified with concentrated hydrochloric acid, and concentrated under reduced pressure. To the residue was added water, and the precipitate was collected by filtration. Methanol (15 ml) and concentrated sulfuric acid (300 μl) were added thereto and the resultant was heated at 85° C. for 2.5 hours. The reaction solution was concentrated under reduced pressure and diluted with water, and the resultant was neutralized with saturated sodium hydrogencarbonate. The precipitated solid was collected by filtration to give 215 mg (0.54 mmol) of the titled compound as a white solid. Yield: 52%.

¹H NMR (DMSO-d₆) δ 9.89 (1H, brs), 7.53 (1H, dd, J=2.4, 8.2 Hz), 7.40 (1H, dd, J=7.8, 8.2 Hz), 7.36 (1H, dd, J=1.6. 2.4 Hz), 7.19 (1H, dd, J=1.6, 7.8 Hz), 6.43 (2H, brs), 4.36-4.34 (2H, m), 4.08-4.04 (4H, m), 3.82 (3H, s), 1.63-1.60 (2H, m), 1.40-1.35 (2H, m), 0.89 (3H, t, J=7.4 Hz).

EXAMPLE 2 Synthesis of 2-butoxy-8-oxo-9-[2-(3-methoxycarbonylmethylphenoxy)ethyl]adenine

From 2-butoxy-9-[2-(3-methoxycarbonylmethylphenoxy)ethyl]adenine 160 mg (0.40 mmol) obtained in Reference Example 3 by the same manner to Example 1, the titled compound was obtained as a white solid in an amount of 49 mg (0.12 mmol). Yield: 29%.

¹H NMR (DMSO-d₆) δ9.90 (1H, s), 7.20 (1H, td, J=1.5, 7.4 Hz), 6.84-6.81 (3H, m), 6.43 (2H, brs), 4.24 (2H, t, J=5.8 Hz), 4.12 (2H, t, J=6.6 Hz), 4.03 (2H, t, J=5.8 Hz), 3.61 (2H, s), 3.59 (3H, s), 1.66-1.61 (2H, m), 1.39-1.35 (2H, m), 0.90 (3H, t, J=7.4 Hz).

EXAMPLE 2-1 Methyl [3-({[2-(6-amino-2-butoxy-8-oxo-7,8-dihydro-9H-purin-9-yl)ethyl]amino}methyl)phenyl]acetate

(i) 2-Chloro-9-(tetrahydro-2H-pyran-2-yl)-9H-purine-6-amine

2,6-dichloro-9-(tetrahydro-2H-pyran-2-yl)-9H-purine (55 g) was dissolved in 7N ammonia-methanol solution, and heated in a sealed flask at 100° C. for 6 hours. The reaction mixture was cooled to room temperature, followed by standing overnight and filtration to give the titled compound. Yield: 40 g (80%).

¹H NMR δ (CDCl₃) 8.02 (1H, s), 5.94 (2H, bs), 5.71 (1H, dd), 4.15-4.22 (1H, m), 3.75-3.82 (1H, m), 1.27-2.12 (6H, m).

(ii) 2-butoxy-9-(tetrahydro-2H-pyran-2-yl)-9H-purine-6-amine

The compound (40 g) obtained in the step (i) was dissolved in 19% sodium butoxide-butanol solution, and heated under reflux for 6 hours. The obtained suspension was cooled to room temperature, diluted with water and extracted with diethyl ether. The organic layer was washed with water, dried and concentrated under reduced pressure. The residue was dissolved in a mixed solvent of isohexane and diethyl ether to crystallize. The resulting crystals were collected by filtration to give the titled compound. Yield: 19 g (64%).

¹H NMR δ (CDCl₃) 7.87 (1H, s), 5.56-5.68 (3H, m), 4.31-4.35 (2H, t), 4.14-4.17 (1H, m), 3.76-3.80 (1H, m), 1.49-2.08 (10H, m), 0.98 (3H, t).

(iii) 8-bromo-2-butoxy-9-(tetrahydro-2H-pyran-2-yl)-9H-purine-6-amine

The compound obtained in the above step (ii) (30 g) was dissolved in dichloromethane (200 ml), and under stirring at room temperature, N-bromosuccinimide (27 g) was slowly added, followed by stirring at room temperature overnight. A 20% aqueous sodium thiosulfate solution was added, and the separated aqueous layer was extracted with dichloromethane, and the organic layer was washed with an aqueous saturated sodium hydrogencarbonate solution and saturated brine and concentrated under reduced pressure. The residue was dissolved in ethyl acetate, washed with water and saturated brine, and dried. The obtained solution was filtered through a silica gel and concentrated under reduced pressure. The residue was dissolved in a mixed solvent of isohexane and diethy ether to crystallize, which was then collected by filtration to give 26 g of a product. The filtrate was concentrated and the residue was purified by column chromatography (ethylacetate: isohexane) to give a product 2.5 g. As the combined products, the titled compound was obtained totally 28.5 g (75%) as a yellow solid. mp 148-150° C.

¹H NMR δ (CDCl₃) 5.59-5.64 (3H, m), 4.32 (2H, m), 4.17 (1H, m), 3.74 (1H, m), 3.08 (1H, m), 2.13 (1H, d), 1.48-1.83 (8H, m), 0.98 (3H, t).

(iv) 2-Butoxy-8-methoxy-9-(tetrahydro-2H-pyran-2-yl)-9H-purine-6-amine

Under nitrogen atmosphere, to methanol (400 ml) was added sodium (3.7 g). To the obtained solution was added the compound obtained in the step (iii) (28.5 g) and the mixture was heated at 65° C. for 9 hours. The reaction solution was concentrated under reduced pressure and water (500 ml) was added thereto. The separated aqueous layer was extracted with ethyl acetate and washed with saturated brine, followed by concentration. The residue was crystallized from diethyl ether to give the titled compound. Yield: 14.2 g (98%).

¹H NMR δ (CDCl₃) 5.51 (1H dd), 5.28 (2H, bs), 4.29 (2H, t), 4.11-4.14 (4H, m), 3.70 (1H, m), 2.76-2.80 (1H, m), 2.05 (1H, d), 1.47-1.81 (8H, m), 0.97 (3H, t).

(v) 2-Butoxy-8-methoxy-9H-purin-6-amine trifluoroacetate

The compound (24 g) obtained in the step (iv) was dissolved in methanol (300 ml) and trifluoroacetic acid (30 ml) was added thereto, and the mixture was stirred at room temperature for 72 hours and concentrated under reduced pressure. A mixture of methanol and ethyl acetate was added thereto to precipitate the titled compound as a white solid. Yield: 21 g (80%).

¹H NMR δ (CD₃OD) 4.48 (2H, t), 4.15 (3H, s), 1.80 (2H, quintet), 1.50 (2H, sextet), 0.99 (3H, t).

(vi) 2-[2-(6-Amino-2-butoxy-8-methoxy-9H-purin-9-yl)ethyl]-1H-isoindol-1,3(2H)-dione

In dimethylformamide, a mixture of the compound obtained in the step (v) (3 g) and potassium carbonate (3.54 g) was stirred at 60° C. for 1 hour. The resultant was cooled to room temperature, and 2-(2-bromoethyl)-1H-isoindol-1,3(2H)-dione (2.60 g) was added and stirred at room temperature overnight. Ethyl acetate and water were added thereto and the organic layer was separated, washed with saturated brine, dried and concentrated under reduced pressure. The residue was purified by column chromatography (methanol: dichloromethane) to give the titled compound. Yield: 2.6 g (74%); MS APCI+ve 412 (M+H).

(vii) 9-(2-Aminoethyl)-butoxy-8-methoxy-9H-purin-6-amine

The compound obtained in the step (vi) (1 g) was dissolved in ethanol (10 ml), and hydrazine monohydrate (1 ml) was added thereto. The mixture was heated under reflux for 2 hours. The resultant was cooled to room temperature and concentrated under reduced pressure, and the residue was suspended in dichloromethane (10 ml) and stirred for 1 hour. The suspension was filtered, washed with dichloromethane, and the filtrate was concentrated under reduced pressure to give the titled compound. Yield: 700 mg (99%); MS APCI+ve 282 (M+H).

¹H NMR δ (DMSO d₆) 6.76 (2H, brs), 4.10-4.18 (2H, m), 4.04 (3H, s), 3.81 (2H, t), 2.82 (2H, t), 1.62-1.69 (2H, m), 1.34-1.46 (2H, m), 0.92 (3H, t).

(viii) Methyl [3-({[2-(6-amino-2-butoxy-8-methoxy-9H-purin-9-yl)ethyl]amino}methyl)phenyl]acetate

The compound obtained in the step (vii) (200 mg) and methyl (3-formylphenyl)acetate (133 mg) were dissolved in methanol (5 ml) and the mixture was stirred at room temperature for 4 hours. Sodium borohydride (32 mg) was added and the mixture was stirred at room temperature overnight. To the reaction solution were added dichloromethane (100 ml) and water (100 ml) and the organic layer was separated, washed with water and saturated brine and dried. To the obtained solution was added polymer supported aldehyde resin (300 mg) and the mixture was agitated at room temperature overnight. The resin was removed by filtration and the filtrate was concentrated under reduced pressure to give the titled compound 200 mg. The product was used in the next reaction without further purification. MS APCI+ve 444 (M+H).

(ix) Methyl [3-({[2-(6-amino-2-butoxy-8-oxo-7,8-dihydro-9H-purin-9-yl)ethyl]amino}methyl)phenyl]acetate

To the compound obtained in the step (viii) solution (200 mg) in methanol (5 ml) was added 4N hydrochloric acid-dioxane (1 ml). The mixture was stirred at room temperature overnight and concentrated under reduced pressure. To the residue were added water (3 ml) and an aqueous saturated sodium hydrogen carbonate solution (3 ml) and extracted with dichloromethane and ethyl acetate. The organic layer was dried and concentrated under reduced pressure and purified by column chromatography (methanol: dichloromethane). Crystallization from dichloromethane/acetonitrile gave the titled compound as a white powder. Yield: 50 mg (15%); MS APCI+ve 429 (M+H).

¹H NMR δ (DMSO d₆) 10.34 (1H, brs), 9.04 (2H, brs), 7.31-7.41 (4H, m), 4.21 (2H, m), 4.14 (2H, t), 4.05 (2H, brt), 3.69 (3H, s), 3.62 (2H, s), 3.30 (2H, m), 1.58-1.68 (2H, m), 1.31-1.44 (2H, m), 0.91 (3H, t).

EXAMPLE 2-2 [3-({[2-(6-Amino-2-butoxy-8-oxo-7,8-dihydro-9H-purin-9-yl)ethyl]amino}methyl)phenyl]acetic acid

To the compound obtained in Example 1 solution (30 mg) in methanol (1 ml) was added 5N aqueous sodium hydroxide solution (1 ml) and the mixture was stirred at room temperature for 6 hours, followed by concentration under reduced pressure. Water was added thereto and the resultant was neutralized with acetic acid. The precipitated solid was collected by filtration to give the titled compound. Yield: 9 mg (31%); MS APCI+ve 415 (M+H).

¹H NMR δ (DMSO d₆) 6.89-7.02 (4H, m), 6.69 (2H, brs), 4.12 (2H, t), 3.73 (2H, t, J), 3.57 (2H, s), 3.16 (2H, s), 2.79 (2H, t), 1.57-1.65 (2H, m), 1.34-1.41 (2H, m), 0.91 (3H, t).

EXAMPLE 2-3 Methyl 3-({[3-(6-amino-2-butoxy-8-oxo-7,8-dihydro-9H-purin-9-yl)propyl]amino}methyl)benzoate

(i) 3-[2-(6-Amino-2-butoxy-8-methoxy-9H-purin-9-yl)propyl]-1H-isoindol-1,3(2H)-dione

Using the compound obtained in Example 1 step (v) and 2-(3-bromopropyl)-1H-isoindole-1,3(2H)-dione, the titled compound was obtained by the same manner to Example 2-1 (vi). Yield: 2 g (55%).

¹H NMR δ (DMSO d₆) 7.83 (4H, m), 6.73 (2H, brs), 4.06 (2H, t,), 4.01 (3H, s), 3.89 (2H, t), 3.58 (2H, t), 2.07-2.14 (2H, m), 1.55-1.62 (2H, m), 1.31-1.40 (2H, m), 0.90 (3H, t).

(ii) 9-(3-Aminopropyl)-2-butoxy-8-methoxy-9H-purine-6-amine

The titled compound was obtained by using the compound obtained in the step (i) by the same manner to Example 2-1 step (vii). Yield: 400 mg (50%).

¹H NMR δ (DMSO d₆) 6.77 (2H, brs), 4.16 (2H, t), 4.05 (3H, s), 3.89 (2H, t), 2.46-2.52 (2H, m), 1.61-1.76 (4H, m), 1.35-1.45 (2H, m), 0.92 (3H, t).

(iii) Methyl 3-({[3-(6-amino-2-butoxy-8-methoxy-9H-purin-9-yl)propyl]amino}methyl)benzoate

The titled compound was obtained by using the compound obtained in the step (ii) by the similar manner to Example 2-1 step (viii). This product was used in the next reaction without further purification. Yield: 250 mg (60%); MS APCI+ve 444 (M+H).

(iv) Methyl 3-({[3-(6-amino-2-butoxy-8-oxo-7,8-dihydro-9H-purin-9-yl)propyl]amino}methyl)benzoate

The titled compound was obtained by using the compound obtained in the step (iii) by the similar manner to Example 2-1 step (ix). Yield: 176 mg (43%); m.p. 214-218° C., MS APCI+ve 429 (M+H).

¹H NMR δ (DMSO d₆) 9.90 (1H, brs), 7.92 (1H, s), 7.80-7.82 (1H, m), 7.57-7.59 (1H, m), 7.41-7.45 (1H, m), 6.41 (2H, brs), 4.10 (2H, t), 3.74 (3H, s), 3.70-3.72 (4H, m), 2.46-2.55 (2H, m), 1.76-1.90 (2H, m), 1.56-1.63 (2H, m), 1.30-1.40 (2H, m), 0.89 (3H, t).

EXAMPLE 2-4 3-({[3-(6-Amino-2-butoxy-8-oxo-7,8-dihydro-9H-purin-9-yl)propyl]amino}methyl)benzoic acid

The titled compound was obtained by using the compound obtained in Example 2-3 by the similar manner to Example 2-2. Yield: 64 mg (33%); MS APCI+ve 415 (M+H).

¹H NMR δ (CD₃OD) 7.89 (1H, s), 7.83-7.86 (1H, m), 7.27-7.39 (2H, m), 4.25 (2H, t), 3.91 (2H, t), 3.78 (2H, s), 2.62 (2H, t), 1.96-2.03 (2H, m), 1.68-1.75 (2H, m), 1.42-1.52 (2H, m), 0.98 (3H, t).

EXAMPLE 2-5 Methyl 4-({[3-(6-amino-2-butoxy-8-oxo-7,8-dihydro-9H-purin-9-yl)propyl]amino}methyl)benzoate

(i) Methyl 4-({[3-(6-amino-2-butoxy-8-methoxy-9H-purin-9-yl)propyl]amino}methyl)benzoate

The titled compound was obtained by using the compound obtained in Example 2-3 step (ii) and methyl 4-formylbenzoate by the similar manner to Example 2-3 step (i). Yield: 90 mg; MS APCI+ve 444 (M+H).

(ii) Methyl 4-({[3-(6-amino-2-butoxy-8-oxo-7,8-dihydro-9H-purin-9-yl)propyl]amino}methyl)benzoate

The titled compound was obtained by using the compound obtained in the step (i) by the similar manner to Example 2-1 step (ix). Yield: 6 mg (11%); MS APCI+ve 429 (M+H).

¹H NMR δ (DMSO d₆) 7.87-7.89 (2H, m), 7.43-7.46 (2H, m), 6.43 (2H, brs), 4.10 (2H, t), 3.84 (3H, s), 3.71-3.74 (4H, m), 2.44-2.50 (2H, m), 1.76-1.83 (2H, m), 1.56-1.64 (2H, m), 1.30-1.40 (2H, m), 0.89 (3H, t).

EXAMPLE 2-6 4-({[3-(6-Amino-2-butoxy-8-oxo-7,8-dihydro-9H-purin-9-yl)propyl]amino}methyl)benzoic acid

The titled compound was obtained by using the compound obtained in Example 2-5 by the similar manner to Example 2-2. Yield: 2.6 mg (50%); MS APCI+ve 415 (M+H).

¹H NMR δ (CD₃OD) 7.90-7.93 (2H, m), 7.29-7.32 (2H, m), 4.24-4.26 (2H, m), 3.85-3.93 (2H, m), 3.75 (2H, s), 2.58-2.62 (2H, m), 1.95-2.03 (2H, m), 1.69-1.78 (2H, m), 1.40-1.52 (2H, m), 0.99 (3H, t).

EXAMPLE 2-7 Methyl (3-{[[3-(6-amino-2-butoxy-8-oxo-9H-purin-9-yl)propyl](2-morpholin-4-ylethyl)amino]methyl}phenyl)acetate

(i) Methyl [3-({[3-(6-amino-2-butoxy-8-methoxy-9H-purin-9-yl)propyl]amino}methyl)phenyl]acetate

The titled compound was obtained by using the compound obtained in Example 2-3 step (ii) and methyl (3-formylphenyl)acetate by the similar manner to Example 2-1 step (viii).

Yield: 270 mg (61%); MS APCI+ve 458 (M+H).

(ii) Methyl (3-{[[3-(6-amino-2-butoxy-8-methoxy-9H-purin-9-yl)propyl](2-morpholin-4-ylethyl)amino]methyl}phenyl)acetate

The compound obtained in the step (i) (80 mg) was dissolved in acetonitrile (3 ml) and potassium carbonate (58 mg) was added. The resultant was stirred at room temperature for 10 minutes and 4-(2-chloroethyl)morpholine hydrochloride (39 mg) was added thereto, followed by stirring at 60° C. overnight. The reaction solution was concentrated under reduced pressure and purified by RPHPLC to give the titled compound. MS APCI+ve 571 (M+H).

(iii) Methyl (3-{[[3-(6-amino-2-butoxy-8-oxo-7,8-dihydro-9H-purin-9-yl)propyl](2-morpholin-4-ylethyl)amino]methyl}phenyl)acetate

The titled compound was obtained by using the compound obtained in the step (ii) by the similar manner to Example 2-1 step (ix). Yield: 4 mg (11%); MS APCI+ve 557 (M+H).

¹H NMR δ (CD₃OD) 7.12-7.25 (4H, m), 4.26 (2H, t), 3.88 (2H, t,), 3.61-3.67 (13H, m), 2.42-2.63 (10H, m), 1.91-2.01 (2H, m), 1.67-1.78 (2H, m), 1.42-1.52 (2H, m), 0.98 (3H, t).

EXAMPLE 2-8 Methyl [3-({[4-(6-amino-2-butoxy-8-oxo-7,8-dihydro-9H-purin-9-yl)butyl]amino}methyl)phenyl]acetate

(i) 4-[2-(6-Amino-2-butoxy-8-methoxy-9H-purin-9-yl)butyl]-1H-isoindole-1,3(2H)-dione

The titled compound was obtained by using the compound obtained in Example 2-1 step (v) and 2-(4-bromobutyl)-1H-isoindole-1,3(2H)-dione by the similar manner to Example 2-1 step (vi). Yield: 1.1 g (88%); MS APCI+ve 440 (M+H).

(ii) 9-(4-Aminobutyl)-2-butoxy-8-methoxy-9H-purin-6-amine

The titled compound was obtained by using the compound obtained in the step (i) by the similar manner to Example 2-1 step (vii). Yield: 720 mg (94%); MS APCI+ve 310 (M+H).

(iii) Methyl [3-({[4-(6-amino-2-butoxy-8-methoxy-9H-purin-9-yl)butyl]amino}methyl)phenyl]acetate

The titled compound was obtained by using the compound obtained in the step (ii) and methyl (3-formylphenyl)acetate, by the similar manner to Example 2-1 step (viii). Yield: 200 mg (42%); MS APCI+ve 472 (M+H).

(iv) Methyl [3-({[4-(6-amino-2-butoxy-8-oxo-7,8-dihydro-9H-purin-9-yl)butyl]amino}methyl)phenyl]acetate

The titled compound was obtained by using the compound obtained in the step (iii) by the similar manner to Example 2-1 step (ix). Yield: 87 mg (45%); MS APCI+ve 457 (M+H).

¹H NMR δ (DMSO d₆) 7.08-7.26 (4H, m), 6.40 (2H, brs), 4.13 (2H, t), 3.59-3.68 (9H, m), 2.46-2.51 (2H, m), 1.58-1.70 (4H, m), 1.31-1.44 (4H, m), 0.91 (3H, t).

EXAMPLE 2-9 Ethyl 2-[2-(6-amino-2-butoxy-8-oxo-7,8-dihydro-9H-purin-9-yl)ethoxy]benzoate

(i) Methyl 2-[2-(6-amino-2-butoxy-8-methoxy-9H-purin-9-yl)ethoxy]benzoate

The compound obtained in Example 2-1 step (v) was dissolved in dimethylformamide (50 ml), and potassium carbonate (3.52 g) and methyl 2-(2-bromoethoxy)benzoate (2.2 g) were added thereto. The mixture was stirred at room temperature for 96 hours and partitioned between ethyl acetate and 2M hydrochloric acid. The organic layer was dried and concentrated under reduced pressure. The residue was dissolved in methanol and purified by RPHPLC to give the titled compound. Yield: 0.768 g (22%).

(ii) Methyl 2-[2-(6-amino-2-butoxy-8-oxo-7,8-dihydro-9H-purin-9-yl)ethoxy]benzoate

The compound obtained in the step (i) (0.76 g) was dissolved in methanol (10 ml) and hydrochloric acid (20 ml) was added thereto. The mixture was stirred at room temperature for 18 hours and concentrated under reduced pressure to give the titled compound. Yield: 0.562 g (16%).

¹H NMR δ (DMSO d₆) 7.56 (1H, d), 7.48 (1H, t), 7.17 (1H, d), 7.00 (1H, t), 6.40 (2H, s), 4.36 (2H, t), 4.10 (2H, t), 4.06 (2H, t), 3.62 (3H, s), 1.61 (2H, tt), 1.36 (2H, m), 0.90 (3H, t).

(iii) 2-[2-(6-Amino-2-butoxy-8-oxo-7,8-dihydro-9H-purin-9-yl)ethoxy]benzoic acid

The compound obtained in the step (ii) (0.77 g) was dissolved in tetrahydrofuran (7 ml) and methanol (2.3 ml) and 1M lithium hydroxide (2.3 ml) was added thereto and the mixture was stirred at room temperature for 16 hours. The reaction solution was concentrated under reduced pressure and diluted with 2M hydrochloric acid and the resulting white precipitate was collected by filtration, and dried to give the titled compound as a solid, 0.65 g. The product was used in the next reaction without further purification.

(iv) Ethyl 2-[2-(6-amino-2-butoxy-8-oxo-7,8-dihydro-9H-purin-9-yl)ethoxy]benzoate

The compound obtained in the step (iii) (50 mg) was dissolved in dichloromethane (5 ml) and ethanol (0.008 ml), 4-pyrrolidin-1-ylpyridine (2 mg) and 1-(3-dimethylaminopropyl)-3-ethylcarbodiimide iodine methyl (42 mg) were added thereto. The resultant was stirred at room temperature for 12 hours, and to the reaction solution was added 2 M hydrochloric acid. The organic layer was separated and concentrated under reduced pressure. The residue was dissolved in ethanol and purified by RPHPLC to give the titled compound. Yield: 5.6 mg (10%).

¹H NMR δ (DMSO d₆) 7.54 (1H, d), 7.48 (1H, t), 7.17 (1H, d), 7.01 (1H, t), 6.39 (2H, s), 4.36 (2H, t), 4.11 (2H, t), 4.05 (2H, q), 1.61 (2H, tt), 1.37 (m), 1.18 (3H, t), 0.90 (3H, t).

EXAMPLE 2-10 3-(Dimethylamino)propyl 2-[2-(6-amino-2-butoxy-8-oxo-7,8-dihydro-9H-purin-9-yl)ethoxy]benzoate

The compound obtained in Example 2-9 step (iii) (50 mg) was dissolved in dichloromethane (5 ml), and thereto were added 3-(dimethylamino)propane-1-ol (0.016 ml), 4-pyrrolidin-1-ylpyridine (2 mg) and 1-(3-dimethylaminopropyl)-3-ethylcarbodiimide iodine methyl (42 mg). The mixture was stirred at room temperature for 96 hours and applied to a cartridge of SCX resin. The resin was washed with acetonitrile and the fractions were collected by application of 10% aqueous ammonium solution-acetonitrile, and purified by RPHPLC to give the titled compound. Yield: 8.9 mg (14%).

¹H NMR δ (DMSO d₆) 7.57 (1H, d), 7.48 (1H, t), 7.18 (1H, d), 7.01 (1H, t), 6.40 (2H, s), 4.36 (2H, t), 4.09 (2H, t), 4.06 (2H, m), 4.04 (2H, m), 2.24 (2H, t), 2.11 (6H, s), 1.69 (2H, m), 1.59 (2H, m), 1.38 (1H, m), 0.90 (3H, t).

EXAMPLE 2-11 Methyl 3-[4-({[4-(6-amino-2-butoxy-8-oxo-7,8-dihydro-9H-purin-9-yl)butyl]amino}sulfonyl)phenyl]propanoate

The compound obtained in Example 2-8 step (ii) (308 mg), methyl 3-[4-(chlorosulfonyl)phenyl]propanoate (263 mg) and triethylamine (0.284 ml) were mixed under stirring at 60° C. for 1 hour, and then cooled. After concentration under reduced pressure, the residue was purified by RPHPLC. The resulting white substance was dissolved in methanol, and 4M hydrochloric acid-dioxane was added thereto. The mixture was stirred at room temperature overnight and then concentrated under reduced pressure to give the titled compound as a white solid. Yield: 124 mg (24%); mp 150-152° C., MS APCI+ve 521 (M+H).

¹H NMR δ (DMSO d₆) 10.30-10.24 (1H, m), 7.66 (2H, d), 7.51 (1H, t), 7.42 (2H, d), 4.21 (2H, t), 3.63 (2H, t), 3.58 (3H, s), 2.96-2.86 (2H, m), 2.80-2.60 (4H, m), 1.72-1.53 (4H, m), 1.48-1.23 (4H, m), 0.99-0.78 (5H, m).

EXAMPLE 2-12 3-[4-({[4-(6-Amino-2-butoxy-8-oxo-7,8-dihydro-9H-purin-9-yl)butyl]amino}sulfonyl)phenyl]propionic acid

The compound obtained in Example 2-11 (100 mg) and lithium hydroxide (17 mg) were added to tetrahydrofuran (4 ml) and water (2 ml) and the mixture was stirred at room temperature for 16 hours. To the reaction solution was added acetic acid (2 ml) and the mixture was concentrated under reduced pressure. The residue was purified by RPHPLC and appropriate fractions were concentrated under reduced pressure to give the titled compound as a white solid. Yield: 40 mg (41%); mp 210-211° C., MS APCI+ve 507 (M+H).

¹H NMR δ (DMSO d₆) 7.66 (2H, d), 7.36 (2H, d), 6.31 (2H, s), 4.18 (2H, t), 3.69 (2H, t), 2.94 (2H, t), 2.78 (2H, t), 2.57-2.51 (5H, m), 1.75-1.62 (4H, m), 1.51-1.33 (4H, m), 0.95 (3H, t).

EXAMPLE 2-13 Methyl (3-{[[4-(6-amino-2-butoxy-8-oxo-7,8-dihydro-9H-purin-9-yl)butyl](2-pyrrolidin-1-ylethyl)amino]sulfonyl}phenyl)acetate

(i) 9-(4-Bromobutyl)-2-butoxy-8-methoxy-9H-purine-6-amine

The compound obtained in Example 2-1 step (v) (0.5 g) was added to potassium carbonate (0.92 g) and 1,4-dibromobutane (0.85 ml) in dimethylformamide (5 ml), and the mixture was stirred at room temperature for 16 hours. To the reaction solution was added brine and the mixture was extracted with ethyl acetate. The organic layer was washed with brine and concentrated to dryness. The residue was purified by flash column chromatography (ethyl acetate) to give the titled compound, as a white solid. Yield: 370 mg (70%).

¹H NMR δ (CDCl₃) 5.12 (2H, s), 4.28 (2H, t), 4.12 (3H, s), 3.97 (2H, t), 3.44 (2H, t), 2.01-1.69 (6H, m), 1.59-1.40 (2H, m), 0.96 (3H, t).

(ii) 2-Butoxy-8-methoxy-9-{4-[(2-pyrrolidin-1-ylethyl)amino]butyl}-9H-purine-6-amine

The compound obtained in the step (i) (370 mg) and (2-pyrrolidin-1-ylethyl)amine (342 mg) were dissolved in dimethylformamide (5 ml) and the mixture was stirred at 70° C. for 1 hour. The reaction mixture was cooled, filtered and purified by RPHPLC. Appropriate fractions were concentrated under reduced pressure to give the titled compound as a white solid. Yield: 200 mg (50%); MS APCI+ve 406 (M+H).

¹H NMR δ (CDCl₃) 5.05 (2H, s), 4.27 (2H, t), 4.10 (3H, s), 3.94 (2H, t), 2.73-2.53 (6H, m), 2.50-2.44 (5H, m), 1.84-1.72 (6H, m), 1.56-1.43 (6H, m), 0.96 (3H, t).

(iii) Methyl (3-{[[4-(6-amino-2-butoxy-8-oxo-7,8-dihydro-9H-purin-9-yl)butyl](2-pyrrolidin-1-ylethyl)amino]sulfonyl}phenyl)acetate

The compound obtained in the step (ii) (232 mg), methyl [3-(chlorosulfonyl)phenyl]acetate (43 mg) and triethylamine (0.08 ml) were stirred in acetonitrile (10 ml) at 60° C. for 1 hour. The reaction mixture was cooled, concentrated under reduced pressure and purified by RPHPLC. Appropriate fractions were concentrated under reduced pressure to give a white solid 190 mg. The obtained solid was dissolved in methanol (5 ml) and 4M hydrochloric acid-dioxane (2 ml) was added thereto. The mixture was stirred at room temperature overnight. The reaction mixture was concentrated under reduced pressure and purified by RPHPLC, and appropriate fractions were concentrated under reduced pressure to give the titled compound as a white solid. Yield: 100 mg (29%); MS APCI+ve 602 (M+H).

¹H NMR δ (DMSO d₆) 9.84 (1H, s), 7.73-7.71 (1H, m), 7.68-7.63 (1H, m), 7.54-7.50 (2H, m), 6.39 (2H, s), 4.13 (2H, t), 3.83 (2H, s), 3.66 (2H, t), 3.62 (3H, s), 3.13-3.05 (4H, m), 2.44-2.26 (4H, m), 1.68-1.57 (9H, m), 1.49-1.32 (5H, m), 0.91 (3H, t).

EXAMPLE 2-14 (3-{[[4-(6-Amino-2-butoxy-8-oxo-7,8-dihydro-9H-purin-9-yl)butyl](2-pyrrolidin-1-ylethyl)amino]sulfonyl}phenyl)acetic acid

The compound obtained in Example 2-13 (70 mg) and lithium hydroxide (20 mg) were added to tetrahydrofuran (4 ml) and water (2 ml) and by the same manner to Example 2-12, the titled compound was obtained as a white solid. Yield: 35 mg (51%); mp 192-193° C., MS APCI−ve 588 (M−H).

¹H NMR δ (DMSO d₆) 7.69 (1H, s), 7.62 (1H, d), 7.55-7.43 (2H, m), 6.51 (2H, s), 4.13 (4H, t), 3.08 (4H, t), 2.43 (4H, t), 2.36-2.30 (4H, m), 1.69-1.55 (8H, m), 1.48-1.30 (6H, m), 0.91 (3H, t).

EXAMPLE 2-15 Methyl (3-{[[4-(6-amino-2-butoxy-8-oxo-7,8-dihydro-9H-purin-9-yl)butyl](2-methoxyethyl)amino]sulfonyl}phenyl)acetate

(i) 2-Butoxy-8-methoxy-9-{4-[(2-methoxyethyl)amino]butyl}-9H-purine-6-amine

The compound obtained in Example 2-13 step (i) (500 mg) and (2-methoxyethyl)amine (303 mg) were dissolved in acetonitrile (5 ml) and stirred at 80° C. for 1 hour. The reaction mixture was cooled, filtered and purified by RPHPLC to give the titled compound as a white solid. Yield: 270 mg (55%); mp 99-100° C., MS APCI+ve 367 (M+H).

¹H NMR δ (DMSO d₆) 6.77 (2H, s), 4.16 (2H, t), 4.06 (3H, s), 3.83 (2H, t), 3.34-3.31 (3H, m), 3.21 (3H, s), 2.58 (2H, t), 1.75-1.58 (4H, m), 1.48-1.26 (6H, m), 0.92 (3H, t).

(ii) 2-Butoxy-8-oxo-9-{4-[(3-methoxycarbonylmethyl)phenylsulfonyl(2-methoxyethyl)amino]butyl}-9H-purine-6-amine

Using the compound obtained in the step (i) (230 mg), methyl [3-(chlorosulfonyl)phenyl]acetate (157 mg) and triethylamine (0.09 ml), the titled compound was obtained as a white solid by the same manner to Example 2-13 step (iii). Yield: 170 mg (48%); mp 182-183° C., MS APCI+ve 565 (M+H).

¹H NMR δ (DMSO d₆) 9.86 (1H, s), 7.73 (1H, s), 7.68-7.64 (1H, m), 7.56-7.48 (2H, m), 6.41 (2H, s), 4.14 (2H, t), 3.83 (2H, s), 3.69-3.60 (5H, m), 3.38-3.30 (2H, m), 3.20 (2H, t), 3.17-3.06 (5H, m), 1.69-1.56 (4H, m), 1.52-1.32 (4H, m), 0.92 (3H, t).

EXAMPLE 2-16 (3-{[[4-(6-Amino-2-butoxy-8-oxo-7,8-dihydro-9H-purin-9-yl)butyl](2-methoxyethyl)amino]sulfonyl}phenyl)acetic acid

By the same manner to Example 2-12, using the compound obtained in Example 2-15 (100 mg) and a mixed solution of lithium hydroxide solution (20 mg) in tetrahydrofuran (4 ml) and water (2 ml), the titled compound was obtained as a white solid from diethyl ether/isohexane. Yield: 60 mg (61%); mp 171-172° C., MS APC-ve 549 (M−H).

¹H NMR δ (DMSO d₆) 7.67 (1H, s), 7.61-7.40 (4H, m), 6.57 (2H, s), 4.13 (2H, t), 3.69-3.60 (2H, m), 3.58 (2H, s), 3.37-3.30 (2H, m), 3.21-3.12 (5H, m), 3.08-2.99 (2H, m), 1.68-1.56 (2H, m), 1.48-0.99 (4H, m), 0.96-0.77 (6H, m).

EXAMPLE 2-17 Methyl (3-{[[4-(6-amino-2-butoxy-8-oxo-7,8-dihydro-9H-purin-9-yl)butyl](methyl)amino]sulfonyl}phenyl)acetate

The compound obtained in Example 2-13 step (i) (417 mg) and a 40% aqueous methylamine solution (2 ml) were dissolved in acetonitrile (5 ml) and stirred at 80° C. for 1.5 hour. The reaction mixture was cooled, and concentrated under reduced pressure. The residue was dissolved in acetonitrile (5 ml), and using triethylamine (0.16 ml) and methyl [3-(chlorosulfonyl)phenyl]acetate (278 mg), the titled compound was obtained as a white solid by the same manner to Example 2-13 step (iii). Yield: 120 mg (21%); MS APCI+ve 521 (M+H).

¹H NMR δ (DMSO d₆) 7.69 (1H, s), 7.65-7.61 (2H, m), 7.57-7.53 (2H, m), 6.40 (2H, s), 4.14 (2H, t), 3.84 (2H, s), 3.67 (2H, t), 3.63 (3H, s), 2.96 (2H, t), 2.62 (3H, s), 1.69-1.58 (4H, m), 1.49-1.33 (4H, m), 0.91 (3H, t).

EXAMPLE 2-18 (3-{[[4-(6-Amino-2-butoxy-8-oxo-7,8-dihydro-9H-purin-9-yl)butyl](methyl)amino]sulfonyl}phenyl)acetic acid

The compound obtained in Example 2-17 (100 mg) and lithium hydroxide (20 mg) were added to tetrahydrofuran (4 ml) and water (2 ml), followed by conducting a reaction by the same manner to Example 2-12, the titled compound was obtained as a white solid from diethyl ether/isohexane. Yield: 43 mg (64%); mp 171-172° C., MS APC+ve 507 (M+H).

¹H NMR δ (DMSO d₆) 7.63 (1H, s), 7.56-7.43 (3H, m), 6.61 (2H, s), 4.13 (2H, t), 3.67 (2H, t), 3.54 (2H, s), 2.88 (2H, t), 2.59 (3H, s), 1.70-1.57 (4H, m), 1.48-1.30 (4H, m), 0.91 (3H, t).

EXAMPLE 2-19 Methyl [3-({[4-(6-amino-2-butoxy-8-oxo-7,8-dihydro-9H-purin-9-yl)butyl][3-(dimethylamino)-2,2-dimethylpropyl]amino}sulfonyl)phenyl]acetate

The compound obtained in Example 2-13 step (i) (417 mg), triethylamine (0.312 ml) and N,N,2,2-tetramethylpropane-1,3-diamine (146 mg) were dissolved in acetonitrile (5 ml) and stirred at 100° C. for 4 hours. The reaction mixture was cooled and concentrated under reduced pressure and purified by RPHPLC. Appropriate fractions were concentrated under reduced pressure to give a residue 190 mg. The residue was dissolved in acetonitrile (5 ml), and using triethylamine (0.13 ml) and methyl [3-(chlorosulfonyl)phenyl]acetate (112 mg), the titled compound was obtained as a white solid by the same manner to Example 2-13 step (iii). Yield: 83 mg (12%); MS APCI+ve 620 (M+H).

¹H NMR δ (DMSO d₆) 9.82 (1H, s), 7.71 (1H, s), 7.65-7.61 (1H, m), 7.52-7.45 (2H, m), 6.40 (2H, s), 4.13 (2H, t), 3.82 (2H, s), 3.62 (3H, s), 3.57 (2H, t), 3.07-3.01 (2H, m), 2.95 (2H, s), 2.17 (6H, s), 2.04 (2H, s), 1.68-1.57 (2H, m), 1.55-1.31 (6H, m), 0.91 (3H, t), 0.84 (6H, s).

EXAMPLE 2-20 [3-({[4-(6-Amino-2-butoxy-8-oxo-7,8-dihydro-9H-purin-9-yl)butyl][3-(dimethylamino)-2,2-dimethylpropyl]amino}sulfonyl)phenyl]acetic acid

The compound obtained in Example 2-19 (0.165 g) and lithium hydroxide (45 mg) were added to tetrahydrofuran (4 ml) and water (2 ml). The same manner to Example 2-12 was conducted to give the titled compound as a white solid. Yield: 80 mg (51%); mp 175-176° C., MS APC-ve 604 (M−H).

¹H NMR δ (DMSO d₆) 7.74-7.71 (1H, m), 7.64-7.60 (1H, m), 7.58-7.53 (1H, m), 7.51-7.45 (1H, m), 6.63 (2H, s), 4.19 (3H, t), 3.67 (2H, s), 3.10-3.03 (2H, m), 2.99 (2H, s), 2.22 (6H, s), 2.10 (2H, s), 1.74-1.63 (2H, m), 1.62-1.38 (8H, m), 0.97 (3H, t), 0.90 (6H, s).

EXAMPLE 2-21 Methyl [3-({[3-(6-amino-2-butoxy-8-oxo-7,8-dihydro-9H-purin-9-yl)propyl]amino}sulfonyl)phenyl]acetate

The compound obtained in Example 2-3 step (ii) (240 mg), triethylamine (0.12 ml) and methyl [3-(chlorosulfonyl)phenyl]acetate (204 mg) were dissolved in acetonitrile (5 ml), and the same manner to Example 2-13 step (iii) was conducted to give the titled compound as a white solid. Yield: 35 mg (9%); mp 218-219° C., MS APCI+ve 493 (M+H).

¹H NMR δ (DMSO d₆) 7.71-7.61 (2H, m), 7.54 (1H, s), 7.43-7.20 (3H, m), 6.73 (1H, s), 4.16-4.09 (1H, m), 3.84 (1H, s), 3.67 (3H, s), 2.81-2.71 (1H, m), 2.51 (2H, s), 1.83-1.69 (2H, m), 1.68-1.56 (2H, m), 1.45-1.30 (2H, m), 1.14-1.05 (2H, m), 0.95-0.84 (3H, m).

EXAMPLE 2-22 Methyl (3-{[[4-(6-amino-2-butoxy-8-oxo-7,8-dihydro-9H-purin-9-yl)butyl](2-hydroxy-2-methylpropyl)amino]sulfonyl}phenyl)acetate

The compound obtained in Example 2-13 step (i) (371 mg) and 1-amino-2-methylpropane-2-ol (400 mg) were dissolved in acetonitrile (5 ml) and the same manner to Example 2-19 using triethylamine (0.055 ml) and methyl [3-(chlorosulfonyl)phenyl]acetate (93 mg) was conducted to give the titled compound as a white solid. Yield: 140 mg (24%); mp 192-193° C., MS APCI+ve 579 (M+H).

¹H NMR δ (DMSO d₆) 9.81 (1H, s), 7.71 (1H, s), 7.65-7.61 (1H, m), 7.50-7.42 (2H, m), 6.40 (2H, s), 4.46 (1H, s), 4.13 (2H, t), 3.81 (2H, s), 3.62 (3H, s), 3.58-3.52 (2H, m), 3.25-3.17 (2H, m), 1.71-1.54 (2H, m), 1.52-1.32 (7H, m), 1.10 (6H, s), 0.92 (3H, t).

EXAMPLE 2-23 (3-{[[4-(6-Amino-2-butoxy-8-oxo-7,8-dihydro-9H-purin-9-yl)butyl] (2-hydroxy-2-methylpropyl)amino]sulfonyl}phenyl)acetic acid

By the same manner to Example 2-12, the compound obtained in Example 2-22 (70 mg) and lithium hydroxide (20 mg) were added to tetrahydrofuran (4 ml) and water (2 ml) and the mixture was stirred at room temperature for 24 hours. The reaction mixture was concentrated under reduced pressure and partitioned between 2M hydrochloric acid and ethyl acetate. The aqueous layer was extracted with ethyl acetate and the combined organic layer was dried and concentrated under reduced pressure to give the titled compound as a white solid. Yield: 23 mg (34%); MS APCI+ve 565 (M+H).

¹H NMR δ (DMSO d₆) 10.08 (1H, s), 7.69 (1H, s), 7.64-7.59 (1H, m), 4.18 (2H, t), 3.69 (2H, s), 3.61-3.53 (2H, m), 3.24-3.16 (2H, m), 3.03 (2H, s), 1.70-1.59 (2H, m), 1.54-1.34 (8H, m), 1.09 (6H, s), 0.92 (3H, t).

EXAMPLE 2-24 Methyl [3-({[2-(6-amino-2-butoxy-8-oxo-7,8-dihydro-9H-purin-9-yl)ethyl]amino}sulfonyl)phenyl]acetate

The compound obtained in Example 2-1 step (vii) (245 mg), triethylamine (0.13 ml) and methyl [3-(chlorosulfonyl)phenyl]acetate (217 mg) were dissolved in acetonitrile (5 ml) and the same manner to Example 2-13 step (iii) was conducted to give the titled compound as a white solid. Yield: 40 mg (9%); MS APCI+ve 479 (M+H).

¹H NMR δ (DMSO d₆) 7.83 (1H, t), 7.69-7.59 (2H, m), 7.52-7.47 (2H, m), 6.48 (2H, s), 4.15 (2H, t), 3.80 (5H, s), 3.61 (3H, s), 3.14-3.03 (2H, m), 1.70-1.57 (2H, m), 1.46-1.31 (2H, m), 0.92 (2H, t).

EXAMPLE 2-25 Methyl [3-({[4-(6-amino-2-butoxy-8-oxo-7,8-dihydro-9H-purin-9-yl)butyl][(2R)-2,3-dihydroxypropyl]amino}sulfonyl)phenyl]acetate

The compound obtained in Example 2-13 step (i) (400 mg), (2R)-3-aminopropane-1,2-diol (200 mg) were dissolved in acetonitrile (5 ml) and the gummy residue 230 mg was obtained by the same manner to Example 2-13 step (ii). The residue was dissolved in acetonitrile (10 ml) and the same manner to Example 2-13 step (iii) was conducted using triethylamine (0.090 ml) and methyl [3-(chlorosulfonyl)phenyl]acetate (150 mg) to give the titled compound as a white solid. Yield: 170 mg (27%); MS APCI+ve 581 (M+H).

¹H NMR δ (DMSO d₆) 9.83 (1H, s), 7.71 (1H, s), 7.66-7.64 (2H, m), 7.54-7.45 (2H, m), 6.40 (2H, s), 4.75 (1H, d), 4.57 (1H, t), 4.14 (2H, t), 3.82 (2H, s), 3.62 (3H, s), 3.30-3.05 (6H, m), 2.94-2.86 (1H, m), 1.67-1.32 (6H, m), 0.92 (3H, t).

EXAMPLE 2-26 [3-({[4-(6-Amino-2-butoxy-8-oxo-7,8-dihydro-9H-purin-9-yl)butyl][(2R)-2,3-dihydroxypropyl]amino}sulfonyl)phenyl]acetic acid

The compound obtained in Example 2-25 (100 mg) and lithium hydroxide (20 mg) were added to tetrahydrofuran (5 ml) and water (2 ml), and the same manner to Example 2-12 was conducted to give the titled compound as a white solid. Yield: 58 mg (60%); MS APCI+ve 567 (M+H).

¹H NMR δ (DMSO d₆) 7.66 (1H, s), 7.56-7.52 (1H, m), 7.50-7.47 (1H, m), 7.43-7.38 (1H, m), 6.55 (2H, s), 4.13 (2H, t), 3.63 (2H, t), 3.50 (2H, s), 3.39-3.02 (8H, m), 1.67-1.24 (8H, m), 0.91 (3H, t).

EXAMPLE 2-27 Methyl 3-({[4-(6-amino-2-butoxy-8-oxo-7,8-dihydro-9H-purin-9-yl)butyl][3-(dimethylamino)-2,2-dimethylpropyl]amino}sulfonyl)benzoate

The compound obtained in Example 2-13 step (i) (500 mg) and N,N,2,2-tetramethylpropane-1,3-diamine (1.5 ml) were dissolved in acetonitrile (10 ml) and the reaction was conducted by the same manner to Example 2-13 step (ii) to give gummy residue 383 mg as trifluoroacetate. The residue was dissolved in acetonitrile (10 ml), and triethylamine (0.3 ml) and 3-(chlorosulfonyl)benzoic acid (158 mg) were added thereto and the mixture was stirred at 80° C. for 2 hours. The reaction mixture was cooled, concentrated under reduced pressure and purified by RPHPLC. Appropriate fractions were concentrated under reduced pressure to give a solid residue 170 mg. The residue was dissolved in methanol (5 ml) and 4M hydrochloric acid-dioxane (2 ml) was added and stirred at room temperature for 24 hours, and then trimethylsilyl chloride (2 ml) were added thereto and the mixture was stirred at room temperature for further 72 hours. The reaction mixture was concentrated under reduced pressure and purified by RPHPLC. Appropriate fractions were concentrated under reduced pressure to give the titled compound as a white solid. Yield: 8 mg (5%); MS APCI+ve 606 (M+H).

¹H NMR δ (DMSO d₆) 9.85 (1H, s), 8.21 (1H, t), 8.17-8.13 (1H, m), 8.05-8.01 (1H, m), 7.69 (1H, t), 6.41 (2H, s), 4.11 (2H, t), 3.90 (3H, s), 3.58 (2H, t), 3.12-3.06 (2H, m), 2.18 (6H, s), 2.04 (2H, s), 1.67-1.55 (2H, m), 1.52-1.28 (8H, m), 0.91 (3H, t), 0.85 (6H, s).

EXAMPLE 2-28 3-({[4-(6-Amino-2-butoxy-8-oxo-7,8-dihydro-9H-purin-9-yl)butyl][3-(dimethylamino)-2,2-dimethylpropyl]amino}sulfonyl)benzoic acid

The titled compound was obtained as a white solid by the same manner to Example 2-27. Yield: 38 mg (23%); MS ESI+ve 592 (M+H).

¹H NMR δ (DMSO d₆) 9.86 (1H, s), 8.83 (1H, s), 7.70-7.60 (2H, m), 7.40-7.26 (2H, m), 6.41 (2H, s), 4.14-4.10 (2H, m), 4.12 (2H, t), 3.55-3.37 (4H, m), 3.05-2.96 (2H, m), 2.88-2.80 (6H, m), 1.68-1.58 (2H, m), 1.44-1.27 (6H, m), 1.10 (6H, s), 0.92 (3H, t).

EXAMPLE 2-29 Methyl (3-{[[4-(6-amino-2-butoxy-8-oxo-7,8-dihydro-9H-purin-9-yl)butyl](3-morpholin-4-ylpropyl)amino]methyl}phenyl)acetate

The compound obtained in Example 2-13 step (i) (830 mg) and (3-morpholin-4-ylpropyl)amine (3 ml) were dissolved in acetonitrile (10 ml) and stirred at 80° C. for 3 hours. The reaction mixture was cooled and concentrated under reduced pressure, and purified by RPHPLC. Appropriate fractions ware concentrated under reduced pressure to give colorless gummy residue 600 mg. The residue was dissolved in acetonitrile (20 ml), and potassium carbonate (380 mg) and methyl [3-(bromomethyl)phenyl]acetate (336 mg) were added thereto. The mixture was stirred at room temperature for 16 hours. The reaction mixture was partitioned between ethyl acetate and water. Further, an aqueous layer was extracted with ethyl acetate and the combined organic layer was dried and concentrated under reduced pressure. The resulting gummy residue was purified by RPHPLC. Appropriate fractions were concentrated under reduced pressure, and the obtained gummy residue was dissolved in methanol (5 ml) and 4M hydrochloric acid was added thereto and the mixture was stirred at room temperature for 24 hours. The reaction mixture was concentrated under reduced pressure and purified by RPHPLC. Appropriate fractions were concentrated under reduced pressure to give the titled compound as a white solid. Yield: 460 mg (57%); MS APCI+ve 584 (M+H).

¹H NMR δ (CDCl₃) 7.25-7.15 (3H, m), 7.14-7.10 (1H, m), 5.67 (2H, s), 4.26 (2H, t), 3.83 (2H, t), 3.69 (3H, s), 3.67 (2H, t), 3.61 (2H, s), 3.49 (2H, s), 2.46-2.23 (10H, m), 1.83-1.39 (12H, m), 0.96 (3H, t).

EXAMPLE 2-30 (3-{[[4-(6-Amino-2-butoxy-8-oxo-7,8-dihydro-9H-purin-yl)butyl](3-morpholin-4-ylpropyl)amino]methyl}phenyl)acetic acid

The compound obtained in Example 2-29 (200 mg) and lithium hydroxide (100 mg) were added to tetrahydrofuran (15 ml) and water (5 ml) and the same manner as Example 2-12 was conducted to give the titled compound as a white solid. Yield: 130 mg (66%); MS APCI+ve 570 (M+H).

¹H NMR δ (CDCl₃) 7.30 (1H, s), 7.15-7.08 (2H, m), 7.03-6.95 (1H, m), 6.10 (1H, s), 4.20 (2H, t), 3.74 (2H, s), 3.64 (2H, s), 2.62-2.32 (12H, m), 1.76-1.58 (8H, m), 1.54-1.37 (6H, m), 1.21 (2H, t), 0.94 (3H, t).

EXAMPLE 2-31 Methyl [3-({[4-(6-amino-2-butoxy-8-oxo-7,8-dihydro-9H-purin-9-yl)butyl][3-(dimethylamino)-2,2-dimethylpropyl]amino}methyl)phenyl]acetate

Using the compound obtained in Example 2-13 step (i) (350 mg), N,N,2,2-tetramethylpropane-1,3-diamine (1 ml), potassium carbonate (500 mg) and methyl[3-(bromomethyl)phenyl]acetate (200 mg), the same manner to Example 2-29 was conducted to give the titled compound as a white solid. Yield: 60 mg (13%); MS APCI+ve 570 (M+H).

¹H NMR δ (CDCl₃) 7.25-7.19 (3H, m), 7.13-7.08 (1H, m), 5.63 (2H, s), 5.63 (2H, s), 4.26 (2H, t), 3.78 (2H, t), 3.69 (3H, s), 3.62 (2H, s), 3.59 (2H, s), 2.38 (2H, t), 2.31 (2H, s), 2.24 (6H, s), 1.79-1.43 (8H, m), 0.96 (3H, t), 0.86 (6H, s).

EXAMPLE 2-32 [3-({[4-(6-Amino-2-butoxy-8-oxo-7,8-dihydro-9H-purin-9-yl)butyl][3-(dimethylamino)-2,2-dimethylpropyl]amino}methyl)phenyl]acetic acid

Using the compound obtained in Example 2-31 (50 mg) and lithium hydroxide (15 mg), the same manner to Example 2-12 was conducted to give the titled compound as a white solid. Yield: 10 mg (21%); mp 189-190° C., MS APCI+ve 556 (M+H).

¹H NMR δ (DMSO d₆) 7.78-7.56 (1H, m), 7.28-7.09 (3H, m), 5.90 (2H, s), 4.26-4.17 (2H, m), 3.77-3.68 (2H, m), 3.58 (2H, s), 3.54 (2H, s), 2.44-2.10 (13H, m), 1.81-1.55 (4H, m), 1.50-1.38 (5H, m), 0.95 (3H, t), 0.90 (6H, s).

EXAMPLE 2-33 Methyl [3-({[4-(6-amino-2-butoxy-8-oxo-7,8-dihydro-9H-purin-9-yl)butyl][3-(2-oxopyrrolidin-1-yl)propyl]amino}methyl)phenyl]acetate

Using the compound obtained in Example 2-13 step (i) (400 mg), 1-(3-aminopropyl)pyrrolidin-2-on (1 ml), potassium carbonate (175 mg) and methyl [3-(bromomethyl)phenyl]acetate (175 mg), the same manner to Example 2-29 was conducted to give the titled compound as a white solid. Yield: 200 mg (48%); mp 115-116° C., MS APCI+ve 582 (M+H).

¹H NMR δ (CDCl₃) 10.46 (1H, s), 7.24-7.10 (4H, m), 5.88 (2H, s), 4.27 (2H, t), 3.87 (2H, t), 3.68 (3H, s), 3.61 (2H, s), 3.48 (2H, s), 3.27 (2H, t), 3.22-3.18 (2H, m), 2.41-2.32 (6H, m), 2.01-1.90 (2H, m), 1.82-1.55 (6H, m), 1.52-1.41 (4H, m), 0.96 (3H, t).

EXAMPLE 2-34 [3-({[4-(6-Amino-2-butoxy-8-oxo-7,8-dihydro-9H-purin-9-yl)butyl][3-(2-oxopyrrolidin-1-yl)propyl]amino}methyl)phenyl]acetic acid

The compound obtained in Example 2-33 (50 mg) and lithium hydroxide (20 mg) were added to tetrahydrofuran (5 ml) and water (1 ml), and the same manner to Example 2-12 was conducted to give the titled compound as a white solid. Yield: 39 mg (80%); MS APCI+ve 568 (M+H).

¹H NMR δ (CDCl₃) 7.41-7.36 (1H, m), 7.22-7.06 (3H, m), 5.71 (2H, s), 4.23 (2H, t), 3.79 (2H, t), 3.58 (2H, s), 3.53 (2H, s), 3.29-3.21 (4H, m), 2.60-2.57 (1H, m), 2.49-2.38 (5H, m), 2.31 (2H, t), 1.97-1.89 (2H, m), 1.79-1.60 (6H, m), 1.53-1.39 (4H, m), 0.95 (3H, t).

EXAMPLE 2-35 Methyl (3-{[[4-(6-amino-2-butoxy-8-oxo-7,8-dihydro-9H-purin-9-yl)butyl](2-morpholin-4-ylethyl)amino]methyl}phenyl)acetate

Using the compound obtained in Example 2-13 step (i) (500 mg), (2-morpholin-4-ylethyl)amine (1 ml), potassium carbonate (206 mg) and methyl [3-(bromomethyl)phenyl]acetate (180 mg), the same manner to Example 2-29 was conducted to give the titled compound as a white solid. Yield: 100 mg (13%); mp 189-190° C., MS APCI+ve 570 (M+H).

¹H NMR δ (DMSO d₆) 7.26-7.07 (4H, m), 6.38 (2H, s), 4.12 (2H, t), 3.72-3.61 (6H, m), 3.59 (3H, s), 3.51-3.45 (8H, m), 2.45-2.29 (2H, m), 2.25-2.14 (2H, m), 1.90-1.75 (2H, m), 1.68-1.26 (8H, m), 0.90 (3H, t).

EXAMPLE 2-36 (3-{[[4-(6-Amino-2-butoxy-8-oxo-7,8-dihydro-9H-purin-9-yl)butyl](2-morpholin-4-ylethyl)amino]methyl}phenyl)acetic acid

The compound obtained in Example 2-35 (50 mg) lithium hydroxide (20 mg) were added to tetrahydrofuran (5 ml) and water (1 ml), and the same manner to Example 2-12 was conducted to give the titled compound as a white solid. Yield: 35 mg (76%); MS APCI+ve 556 (M+H).

¹H NMR δ (DMSO d₆) 9.95 (1H, s), 7.25-7.07 (4H, m), 6.43 (2H, s), 4.14 (2H, t), 3.65 (2H, t), 3.53-3.46 (6H, m), 2.51 (2H, s), 2.47-2.37 (4H, m), 2.35-2.21 (6H, m), 1.70-1.59 (4H, m), 1.44-1.32 (4H, m), 0.91 (3H, t).

EXAMPLE 2-37 Methyl (3-{[[3-(6-amino-2-butoxy-8-oxo-7,8-dihydro-9H-purin-9-yl)propyl](3-morpholin-4-ylpropyl)amino]methyl}phenyl)acetate

(i) 9-(3-bromopropyl)-2-butoxy-8-methoxy-9H-purine-6-amine

The compound obtained in Example 2-1 step (v) (2 g), potassium carbonate (3.7 g) and 1,3-dibromopropane (2.85 ml) were added to dimethylformamide (5 ml), and the same manner to Example 2-13 step (i) was conducted to give the titled compound as a white solid. Yield: 1.0 g (50%).

¹H NMR δ (CDCl₃) 5.18 (2H, s), 4.28 (2H, t), 4.12 (3H, s), 4.09 (2H, t), 3.38 (2H, t), 2.38-2.31 (2H, m), 1.80-1.73 (2H, m), 1.54-1.45 (2H, m), 0.96 (3H, t).

(ii) Methyl (3-{[[3-(6-amino-2-butoxy-8-oxo-7,8-dihydro-9H-purin-9-yl)propyl](3-morpholin-4-ylpropyl)amino]methyl}phenyl)acetate

Using the compound obtained in the step (i) (481 mg), (3-morpholin-4-ylpropl)amine (1.5 ml), potassium carbonate (150 mg) and methyl [3-(bromomethyl)phenyl]acetate (125 mg), the same manner to Example 2-29 was conducted to give the titled compound as a white solid. Yield: 57 mg (7%); mp 200-201° C., MS APCI+ve 570 (M+H).

¹H NMR δ (DMSO d₆) 7.26-7.07 (4H, m), 6.38 (2H, s), 4.12 (2H, t), 3.72-3.61 (6H, m), 3.59 (3H, s), 3.51-3.45 (8H, m), 2.45-2.29 (2H, m), 2.25-2.14 (2H, m), 1.90-1.75 (2H, m), 1.68-1.26 (8H, m), 0.90 (3H, t).

EXAMPLE 2-38 Methyl [3-({[4-(6-amino-2-butoxy-8-oxo-7,8-dihydro-9H-purin-9-yl)butyl][2-(1H-tetrazol-5-yl)ethyl]amino}methyl)phenyl]acetate

The compound obtained in Example 2-13 step (i) (500 mg) and 3-aminopropane nitrile (471 mg) were dissolved in acetonitrile (10 ml) and stirred at 80° C. for 2 hours. The reaction mixture was cooled, concentrated under reduced pressure and purified by RPHPLC. Appropriate fractions were concentrated under reduced pressure to give a white solid 220 mg. The residue was dissolved in methanol, (3-formylphenyl)acetate (109 mg) was added thereto and the mixture was stirred at room temperature for 1 hour. Sodium borohydride (28 mg) was added thereto and the mixture was stirred at room temperature for further 2 hours. To the reaction mixture was added acetic acid (2 ml) and the mixture was concentrated under reduced pressure and purified by RPHPLC. Appropriate fractions were concentrated under reduced pressure to give a solid 170 mg. The obtained solid was dissolved in toluene (8 ml), and methylsilylazide (0.06 ml) and dibutyl tin oxide (72 mg) were added thereto, followed by stirring at 110° C. for 24 hours. The reaction mixture was cooled, concentrated under reduced pressure and purified by RPHPLC. Appropriate fractions were concentrated under reduced pressure to give a gummy substance. The gummy substance was dissolved in methanol (5 ml), and 4M hydrochloric acid-dioxane (2 ml) was added thereto, followed by stirring at room temperature for 24 hours. The reaction mixture was concentrated under reduced pressure and purified by RPHPLC. Appropriate fractions were concentrated under reduced pressure to give the titled compound as a white solid. Yield: 10 mg (2%); MS APCI+ve 553 (M+H).

¹H NMR δ (CDCl₃) 7.23-6.98 (4H, m), 4.24 (2H, t), 3.97-3.86 (2H, m), 3.67 (3H, s), 3.59 (2H, s), 3.22-3.10 (2H, m), 3.01-2.89 (2H, m), 2.77-2.60 (2H, m), 2.29-1.95 (2H, m), 1.86-1.66 (4H, m), 1.62-1.31 (4H, m), 0.94 (3H, t)

EXAMPLE 2-39 Methyl (3-{[2-(6-amino-2-butoxy-8-oxo-7,8-dihydro-9H-purin-9-yl)ethyl]thio}phenyl)acetate

(i) 9-(2-Bromoethyl)-2-butoxy-8-methoxy-9H-purin-6-amine

The compound obtained in Example 2-1 step (v) (2 g), potassium carbonate (3.7 g) and 1,2-dibromoethane (0.6 ml) were added to dimethylformamide (20 ml), and the same manner to Example 2-13 step (i) was conducted to give the titled compound as a cream colored solid. Yield: 1.2 g (62%).

¹H NMR δ (CDCl₃) 5.15 (2H, s), 4.30 (4H, m), 4.13 (3H, s), 3.65 (2H, t), 1.82-1.72 (2H, m), 1.56-1.43 (2H, m), 0.97 (3H, t).

(ii) Methyl (3-{[2-(6-amino-2-butoxy-8-methoxy-9H-purin-9-yl)ethyl]thio}phenyl)acetate

The compound obtained in the step (i) (200 mg), methyl (3-mercaptophenyl)acetate (110 mg) and potassium carbonate (100 mg) were stirred in dimethylformamide (2 ml) at room temperature. After 1 hour, the reaction was completed and purification by RPHPLC was conducted to give the titled compound as a colorless solid. Yield: 150 mg (58%).

¹H NMR δ (DMSO d₆) 7.28-7.21 (3H, m), 7.11-7.06 (1H, m), 6.74 (2H, s), 4.13 (2H, t), 4.07-4.00 (2H, m), 4.00 (3H, s), 3.66 (2H, s), 3.61 (3H, s), 3.38-3.27 (2H, m), 1.64 (2H, quintet), 1.39 (2H, sextet), 0.91 (3H, t).

(iii) Methyl (3-{[2-(6-amino2-butoxy-8-oxo-7,8-dihydro-9H-purin-9-yl)ethyl]thio}phenyl)acetate

The compound obtained in the step (ii) (135 mg) and 6N hydrochloric acid solution (2 ml) in acetonitrile (10 ml) were stirred under heating for 17 hours. The reaction mixture was concentrated to dryness, and methanol (20 ml) and 4N hydrochloric acid-dioxane were added thereto. The mixture was heated under reflux for 1 hour, and then the solvent was removed by distillation under reduced pressure. The residue was partitioned between an aqueous saturated sodium hydrogen carbonate solution and ethyl acetate. The organic layer was dried and concentrated under reduced pressure and purified by RPHPLC to give the titled compound, as a colorless solid. Yield: 13 mg (10%); mp 232-233° C., MS APCI+ve 432 (M+H).

¹H NMR δ (DMSO d₆+CD₃OD) 7.24 (2H, m), 7.17 (2H, t), 7.04 (1H, d), 4.22 (2H, t), 4.06 (2H, t), 3.67 (3H, s), 3.58 (2H, s), 3.37 (2H, t), 1.73 (2H, quintet), 1.48 (2H, sextet), 0.98 (3H, t).

EXAMPLE 2-40 (3-{[2-(6-Amino-2-butoxy-8-oxo-7,8-dihydro-9H-purin-9-yl)ethyl]thio}phenyl)acetic acid

(i) (3-{[2-(6-Amino-2-butoxy-8-methoxy-9H-purin-9-yl)ethyl]thio}phenyl)acetic acid

The same manner to Example 2-39 step (ii) using (3-mercaptophenyl)acetic acid (100 mg) was conducted to give the titled compound. Yield: 70 mg (28%); MS APCI+ve 432 (M+H).

¹H NMR δ (DMSO d₆) 7.28-7.22 (3H, m), 7.11-7.07 (1H, m), 6.77 (2H, s), 4.14 (2H, t), 4.04 (2H, t), 3.99 (3H, s), 3.55 (2H, s), 3.35 (2H, t), 1.64 (2H, quintet), 1.4 (2H, sextet), 0.92 (3H, t).

(ii) (3-{[2-(6-Amino-2-butoxy-8-oxo-7,8-dihydro-9H-purin-9-yl)ethyl]thio}phenyl)acetic acid

The compound obtained in the step (i) (70 mg) was added to tetrahydrofuran (10 ml) and 6N hydrochloric acid (2 ml). and the mixture was heated under reflux for 3 hours. The solvent was removed by distillation under reduced pressure and purified by RPHPLC to give the titled compound as a solid. Yield: 40 mg (59%); mp 205-207° C., MS APCI-ve 416 (M−H).

¹H NMR δ (DMSO d₆) 12.33 (1H, s), 9.85 (1H, s), 7.31-7.20 (3H, m), 7.08 (1H, d), 6.40 (2H, s), 4.12 (2H, t), 3.89 (2H, t), 3.55 (2H, s), 3.30 (2H, t), 1.64 (2H, quintet), 1.38 (2H, sextet), 0.92 (3H, t).

EXAMPLE 2-41 Methyl (3-{[2-(6-amino-2-butoxy-8-oxo-7,8-dihydro-9H-purin-9-yl)ethyl]amino}phenyl)acetate

(i) Methyl {3-[(2-bromoethyl)amino]phenyl}acetate

Methyl (3-aminophenyl)acetate (1 g) and 1,2-dibromoethane (5 ml) were heated at 100° C. for 5 hours. After cooling, the resultant was purified by column chromatography (ethyl acetate:isohexane 7:3) to give the titled compound as an oil. Yield: 280 mg (17%).

¹H NMR δ (CDCl₃) 7.14 (1H, t), 6.66 (1H, d), 6.59-6.52 (2H, m), 3.69 (3H, s), 3.58-3.53 (6H, m).

(ii) Methyl (3-{[2-(6-amino-2-butoxy-8-methoxy-9H-purin-9-yl)ethyl]amino}phenyl)acetate

To a solution of the compound obtained in Example 2-1 step (v) (0.2 g) in dimethylformamide (2 ml) was added potassium carbonate (236 mg) and then the compound obtained in the step (i) (160 mg) was further added thereto. The mixture was stirred at room temperature overnight. To the reaction mixture was added water and extracted with ethyl acetate. The organic layer was dried, concentrated and purified by RPHPLC to give the titled compound as a colorless solid. Yield: 200 mg (82%); mp 119-120° C., MS APCI+ve 429 (M+H).

¹H NMR δ (DMSO d₆) 7.01 (1H, t), 6.77 (2H, s), 6.52 (1H, d), 6.48 (1H, s), 6.43 (1H, d), 5.82 (1H, t), 4.15 (2H, t), 4.05-3.93 (5H, m), 3.60 (3H, s), 3.50 (2H, s), 3.39-3.33 (2H, m), 1.65 (2H, quintet), 1.40 (2H, sextet), 0.92 (3H, t).

(iii) Methyl (3-{[2-(6-amino-2-butoxy-8-oxo-7,8-dihydro-9H-purin-9-yl)ethyl]amino}phenyl)acetate

To the solution of the compound obtained in the step (ii) (200 mg) in methanol (15 ml) was added 4N dioxane (5 ml) under stirring, and stirred at room temperature for 24 hours, concentrated under reduced pressure and purified by RPHPLC to give the titled compound as a colorless solid. Yield: 13 mg (6.7%); mp 222-223° C., MS APCI+ve 415 (M+H).

¹H NMR δ (DMSO d₆+CD₃OD) 7.01 (1H, t), 6.59-6.43 (3H, m), 4.20 (2H, t), 4.01-3.91 (2H, m), 3.64 (3H, s), 3.49 (2H, s), 3.46-3.38 (2H, m), 1.70 (2H, quintet), 1.45 (2H, sextet), 0.96 (3H, t).

EXAMPLE 2-42 Methyl (3-{[3-(6-amino-2-butoxy-8-oxo-7,8-dihydro-9H-purin-9-yl)propyl]amino}phenyl)acetate

(i) Methyl {3-[(3-bromopropyl)amino]phenyl}acetate

Using 1,3-dibromopropane (1.7 ml) and methyl (3-aminophenyl)acetate (280 mg), the same manner to Example 2-41 step (i) was conducted to give the titled compound as a solid. Yield: 200 mg (70%).

¹H NMR δ (CDCl₃) 7.15-7.11 (1H, m), 6.62 (1H, d), 6.56-6.5 (2H, m), 3.69 (3H, s), 3.56-3.48 (4H, m), 3.33 (2H, t), 2.15 (2H, quintet).

(ii) Methyl (3-{[3-(6-amino-2-butoxy-8-methoxy-9H-purin-9-yl)propyl]amino}phenyl)acetate

Using the compound obtained in the step (i) (170 mg), the same manner to Example 2-41 step (ii) was conducted to give the titled compound as a solid. Yield: 220 mg (87%); mp 129-130° C., MS APCI+ve 443 (M+H).

¹H NMR δ (DMSO d₆) 6.99 (1H, t), 6.44-6.38 (3H, m), 4.15 (2H, t), 4.02 (3H, s), 3.94 (2H, t), 3.59 (3H, s), 3.48 (2H, s), 2.96 (2H, t), 1.94 (2H, quintet), 1.64 (2H, quintet), 1.39 (2H, sextet), 0.91 (3H, t).

(iii) Methyl (3-{[3-(6-amino-2-butoxy-8-oxo-7,8-dihydro-9H-purin-9-yl)propyl]amino}phenyl)acetate

Using the compound obtained in the step (ii), the same manner to Example 2-41 step (iii) was conducted to give the titled compound as a solid. Yield: 63 mg (31%); mp 208-209° C., MS APCI+ve 429 (M+H).

¹H NMR δ (DMSO d₆) 9.86 (1H, s), 6.98 (1H, t), 6.46-6.35 (5H, m), 5.61 (1H, t), 4.13 (2H, t), 3.76 (2H, t), 3.58 (3H, s), 3.47 (2H, s), 3.00 (2H, q), 1.90 (2H, quintet), 1.63 (2H, quintet), 1.38 (2H, sextet), 0.91 (3H, t).

EXAMPLE 2-43 (3-{[3-(6-Amino-2-butoxy-8-oxo-7,8-dihydro-9H-purin-9-yl)propyl]amino}phenyl)acetic acid

The compound obtained in Example 2-42 (70 mg) was dissolved in methanol (5 ml) and a lithium hydroxide solution (45 mg) in water (5 ml) was added thereto. The same manner to Example 2-12 was conducted to give the titled compound as a colorless solid. Yield: 14 mg (21%); mp 247° C., MS APCI-ve 413 (M−H).

¹H NMR δ (DMSO d₆) 6.85 (1H, t), 6.73-6.45 (2H, brs), 6.35 (2H, d), 6.28 (1H, d), 5.42 (1H, t), 4.11 (2H, t), 3.71 (2H, t), 3.08 (2H, s), 2.99-2.88 (2H, m), 1.92-1.80 (2H, m), 1.63 (2H, quintet), 1.39 (2H, sextet), 0.92 (3H, t).

EXAMPLE 2-44 Methyl [3-({[3-(6-amino-2-butoxy-8-oxo-7,8-dihydro-9H-purin-9-yl)propyl]amino}methyl)phenyl]acetate

Using the compound obtained in Example 2-7 step (i) (180 mg), the same manner to Example 2-41 step (iii) was conducted to give the titled compound as a solid. Yield: 55 mg (32%); MS APCI+ve 443 (M+H).

¹H NMR δ (DMSO d₆) 7.29 (4H, m), 7.19 (1H, d), 6.58 (2H, s), 6.53 (3H, s), 4.13 (2H, t), 3.85 (2H, s), 3.73 (2H, t), 3.66 (2H, s), 3.60 (3H, s), 2.69 (2H, t), 1.90 (2H, quintet), 1.63 (2H, quintet), 1.38 (2H, sextet), 0.91 (3H, t).

EXAMPLE 2-45 ([3-({[3-(6-Amino-2-butoxy-8-methoxy-9H-purin-9-yl)propyl]amino}methyl)phenyl]acetic acid

Using the compound obtained in Example 2-44 (30 mg), the same manner as Example 2-12 was conducted to give the titled compound. Yield: 26 mg (89%); MS APCI+ve 429 (M+H).

¹H NMR δ (DMSO d₆) 7.45 (1H, d), 7.40 (1H, s), 7.36 (1H, t), 7.30 (1H, d), 4.42 (2H, t), 4.08 (2H, s), 3.83 (2H, t), 3.58 (2H, s), 2.95 (2H, t), 2.16-2.05 (2H, m), 1.73 (2H, quintet), 1.42 (2H, sextet), 0.94 (3H, t).

EXAMPLE 2-46 Methyl (3-{[[2-(6-amino-2-butoxy-8-oxo-7,8-dihydro-9H-purin-9-yl)ethyl] (2-methoxyethyl)amino]methyl}phenyl)acetate

(i) Methyl (3-{[(2-methoxyethyl)amino]methyl}phenyl)acetate oxalate

Under stirring at 0° C., to (2-methoxyethyl)amine (2.5 ml) was added methyl [3-(bromomethyl)phenyl]acetate (0.5 g) and the mixture was stirred for 5 minutes. The resultant was purified by column chromatography (dichloromethane: 7N-ammonia-methanol, 9:1), and 1N oxalic acid in ethanol was added thereto to give the titled compound as a monooxalate. Yield: 630 mg (93%).

¹H NMR δ (DMSO d₆) 7.42-7.27 (4H, m), 4.11 (2H, s), 3.70 (2H, s), 3.62 (3H, s), 3.58 (2H, t), 3.28 (3H, s), 3.05 (2H, t).

(ii) Methyl (3-{[[2-(6-amino-2-butoxy-8-methoxy-9H-purin-9-yl)ethyl](2-methoxyethyl)amino]methyl}phenyl)acetate

A suspension of the compound obtained in the step (i) (571 mg), the compound obtained in Example 2-39 step (i) (300 mg) and potassium carbonate (730 mg) in dimethylformamide (4 ml) was stirred at 55° C. for 4 days. The resultant was cooled and filtrated, and the filtrate was purified by RPHPLC to give the titled compound as a colorless solid. Yield: 140 mg (32%); MS APCI+ve 501 (M+H).

¹H NMR δ (CDCl₃) 7.17-7.06 (2H, m), 6.98 (2H, d), 6.94 (2H, s), 5.13 (2H, s), 4.19 (2H, t), 4.01-3.96 (5H, m), 3.68 (3H, s), 3.63 (2H, s), 3.55 (2H, s), 3.38 (2H, t), 3.26 (3H, s), 2.86 (2H, t), 2.73 (2H, t), 1.72 (2H, quintet), 1.48 (2H, sextet), 0.95 (3H, t).

(iii) Methyl 3-{[[2-(6-amino-2-butoxy-8-oxo-7,8-dihydro-9H-purin-9-yl)ethyl](2-methoxyethyl)amino]methyl}phenyl)acetate

Using the compound obtained in the step (ii) (130 mg), the same manner to Example 2-41 step (iii) was conducted to give the titled compound as a solid. Yield: 120 mg (95%); MS APCI+ve 487 (M+H).

¹H NMR δ (DMSO d₆) 9.80 (1H, s), 7.15-7.10 (2H, m), 7.07-7.00 (2H, m), 6.36 (2H, s), 4.05 (2H, t), 3.76 (2H, t), 3.61 (2H, s), 3.58 (3H, s), 3.56 (2H, s), 3.30 (2H, s), 3.14 (3H, s), 2.76 (2H, t), 2.60 (2H, t), 1.59 (2H, quintet), 1.35 (2H, sextet), 0.89 (3H, t).

EXAMPLE 2-47 (3-{[[2-(6-Amino-2-butoxy-8-methoxy-9H-purin-9-yl)ethyl](2-methoxyethyl)amino]methyl}phenyl)acetic acid

Using the compound obtained in Example 2-46 (40 mg), the same manner to Example 2-12 was conducted to give the titled compound. Yield: 35 mg (90%); MS APCI+ve 473 (M+H).

¹H NMR δ (DMSO d₆) 7.08 (1H, d), 7.02 (1H, t), 6.89-6.81 (2H, m), 6.64 (2H, s), 4.10 (2H, t), 3.72 (2H, t), 3.50 (2H, s), 3.31 (2H, t), 3.23 (2H, s), 3.15 (3H, s), 2.74 (2H, t), 2.61 (2H, t), 1.62 (2H, quintet), 1.38 (2H, sextet), 0.91 (3H, t).

EXAMPLE 2-48 Methyl (3-{[2-(6-amino-2-butoxy-8-oxo-7,8-dihydro-9H-purin-9-yl)ethyl]sulfonyl}phenyl)acetate

(i) Methyl (3-{[2-(6-amino-2-butoxy-8-methoxy-9H-purin-9-yl)ethyl]sulfonyl}phenyl)acetate

The compound obtained in Example 2-39 step (ii) (200 mg) was dissolved in water (15 ml) and acetone (20 ml), and Oxone® (610 mg) was added together with sufficient sodium carbonate to maintain basic condition and stirred at room temperature for 0.5 hour. To the reaction solution was added water and the mixture was extracted with ethyl acetate. The organic layer was concentrated and the residue was purified by RPHPLC to give the titled compound as a colorless solid. Yield: 90 mg (42%); MS APCI+ve 478 (M+H).

¹H NMR δ (CD₃OD) 7.64-7.61 (1H, m), 7.60-7.58 (1H, m), 7.50-7.47 (1H, m), 7.40 (1H, t), 4.32 (2H, t), 4.26 (2H, t), 4.09 (3H, s), 3.91 (2H, t), 3.69 (3H, s), 3.67 (2H, s), 1.76 (2H, quintet), 1.51 (2H, sextet), 1.00 (3H, t).

(ii) Methyl (3-{[2-(6-amino-2-butoxy-8-oxo-7,8-dihydro-9H-purin-9-yl)ethyl]sulfonyl}phenyl)acetate

Using the compound obtained in the step (i) (80 mg), the same manner to Example 2-41 step (iii) was conducted to give the titled compound as a colorless solid. Yield: 30 mg (38%); mp 246-247° C., MS APCI+ve 464 (M+H).

¹H NMR δ (DMSO d₆) 9.78 (1H, s), 7.77-7.73 (2H, m), 7.60-7.58 (1H, m), 7.53 (1H, t), 6.38 (2H, s), 4.12 (2H, t), 3.98 (2H, t), 3.82 (2H, t), 3.78 (2H, s), 3.63 (3H, s), 1.65 (2H, quintet), 1.40 (2H, sextet), 0.93 (3H, t).

EXAMPLE 2-49 Methyl (3-{[[2-(6-amino-2-butoxy-8-oxo-7,8-dihydro-9H-purin-9-yl)ethyl](methyl)amino]methyl}phenyl)acetate

(i) Methyl {3-[(methylamino)methyl]phenyl}acetate oxalate

To a 40% aqueous methylamine solution (10 ml) was added methyl [3-(bromomethyl)phenyl]acetate (3 g). The mixture was stirred for 0.5 hour, extracted with ethyl acetate, and concentrated under reduced pressure. The residue was dissolved in ethanol (100 ml) and acetic acid (10 ml). The resulting solution was stirred at room temperature for 1 hour in the presence of a 10% palladium-carbon catalyst under hydrogen atmosphere, and then the catalyst was removed by filtration. The filtrate was concentrated under reduced pressure and the residue was partitioned between 2N hydrochloric acid and ethyl acetate. After collecting the aqueous layer, it was made alkaline by potassium carbonate and extracted with ethyl acetate. The extract was dried and concentrated to give an and oil (1 g). To the obtained oil in ethanol (5 ml) was added oxalic acid (467 mg) to give the titled compound as a colorless solid. Yield: 1.3 g (37%).

¹H NMR δ (DMSO d₆) 7.41-7.28 (4H, m), 4.09 (2H, s), 3.71 (2H, s), 3.62 (3H, s), 2.54 (3H, s).

(ii) Methyl (3-{[[2-(6-amino-2-butoxy-8-methoxy-9H-purin-9-yl)ethyl](methyl)-amino]methyl}phenyl)acetate

Using the compound obtained in the step (i) (500 mg) and the compound obtained in Example 2-39 step (i) (300 mg), the same manner as Example 2-46 step (ii) was conducted to give the titled compound as a colorless solid. Yield: 130 mg (33%); MS APCI+ve 457 (M+H).

¹H NMR δ (CD₃OD) 7.11-7.01 (2H, m), 6.89-6.84 (2H, m), 4.16 (2H, t), 4.06-3.99 (5H, m), 3.64 (3H, s), 3.51 (2H, s), 3.46 (2H, s), 2.68 (2H, t), 2.33 (3H, s), 1.68 (2H, quintet), 1.44 (2H, sextet), 0.95 (3H, t).

(iii) Methyl (3-{[[2-(6-amino-2-butoxy-8-oxo-7,8-dihydro-9H-purin-9-yl)ethyl](methyl)amino]methyl}phenyl)acetate

Using the compound obtained in the step (ii) (125 mg), the same manner to Example 2-41 step (iii) was conducted to give the titled compound as a cream colored solid. Yield: 85 mg (97%); MS APCI+ve 443 (M+H).

¹H NMR δ (DMSO d₆) 9.84 (1H, s), 7.14 (1H, t), 7.06 (1H, d), 7.03-6.96 (2H, m), 6.39 (2H, s), 4.06 (2H, t), 3.80 (2H, t), 3.59 (3H, s), 3.56 (2H, s), 3.47 (2H, s), 2.63 (2H, t), 2.18 (3H, s), 1.59 (2H, quintet), 1.34 (2H, sextet), 0.89 (3H, t).

EXAMPLE 2-50 (3-{[[2-(6-Amino-2-butoxy-8-oxo-7,8-dihydro-9H-purin-9-yl)ethyl](methyl)amino]methyl}phenyl)acetic acid

Using the compound obtained in Example 2-49 (60 mg), the same manner to Example 2-12 was conducted to give the titled compound as a solid. Yield: 35 mg (60%); mp 164-166° C., MS APCI-ve 427 (M−H).

¹H NMR δ (DMSO d₆) 9.90 (1H, s), 7.12 (1H, t), 7.06 (1H, d), 7.01-6.95 (2H, m), 6.39 (2H, s), 4.06 (2H, t), 3.80 (2H, t), 3.45 (4H, d), 2.64 (2H, t), 2.17 (3H, s), 1.59 (2H, quintet), 1.34 (2H, sextet), 0.89 (3H, t).

EXAMPLE 2-51 Methyl 4-[3-(6-amino-2-butoxy-8-oxo-7,8-dihydro-9H-purin-9-yl)-2-hydroxypropoxy]benzoate

(i) tert-Butyl 4-[3-(6-amino-2-butoxy-8-methoxy-9H-purin-9-yl)-2-hydroxypropoxy]benzoate

A suspension of the compound obtained in Example 2-1 step (v) (330 mg), tert-butyl 4-(oxilan-2-ylmethoxy)benzoate (256 mg) and potassium carbonate (365 mg) in 2-methylpropane-2-ol (2.5 ml) was heated at 50° C. for 24 hours. The mixture was cooled and partitioned between water and ethyl acetate. The organic layer was dried, concentrated under reduced pressure and purified by flash column chromatography (ethyl acetate:isohexane, 8:2) to give the titled compound as a colorless oil. Yield: 260 mg (62%); Purity about 80%, MS APCI+ve 488 (M+H).

(ii) Methyl 4-[3-(6-amino-2-butoxy-8-oxo-7,8-dihydro-9H-purin-yl)-2-hydroxypropoxy]benzoate

Using the compound obtained in the step (i) (260 mg), the same manner to Example 2-41 step (iii) was conducted to give the titled compound, as a solid. Yield: 35 mg (15%); MS APCI+ve 432 (M+H).

¹H NMR δ (DMSO d₆) 9.88 (1H, s), 7.88 (2H, d), 6.96 (2H, d), 6.40 (2H, s), 5.39 (1H, d), 4.36-4.21 (1H, m), 4.10-3.95 (4H, m), 3.82 (1H, s), 3.81 (3H, s), 1.57 (2H, quintet), 1.34 (2H, sextet), 0.89 (3H, t).

EXAMPLE 2-52 Methyl (3-{[[2-(6-amino-2-butoxy-8-oxo-7,8-dihydro-9H-purin-9-yl)ethyl] (2-hydroxyethyl)amino]methyl}phenyl)acetate

(i) 2-{[2-(6-Amino-2-butoxy-8-methoxy-9H-purin-yl)ethyl]amino}ethanol

To the compound obtained by Example 2-39 step (i) (300 mg) in acetonitrile (5 ml) was added 2-aminoethanol (265 mg) and heated at 70° C. for 24 hours. The reaction mixture was purified by column chromatography (ethyl acetate:7N ammonia-methanol 95:5) to give the titled compound. Yield: 295 mg (100%).

¹H NMR δ (CDCl₃) 5.20 (2H, s), 4.27 (2H, t), 4.11 (3H, s), 4.05 (2H, t), 3.60 (2H, t), 3.03 (2H, t), 2.82 (2H, t), 1.81-1.69 (2H, m), 1.49 (2H, sextet), 0.96 (3H, t).

(ii) Methyl (3-{[[2-(6-amino-2-butoxy-8-methoxy-9H-purin-9-yl)ethyl](2-hydroxyethyl)amino]methyl}phenyl)acetate

A suspension of the compound obtained in the step (i) (270 mg), methyl [3-(bromomethyl)phenyl]acetate (245 mg) and potassium carbonate (140 mg) in acetonitrile (3 ml) was stirred at room temperature for 24 hours. To the resultant was added water and the mixture was extracted with ethyl acetate. The organic layer was dried and concentrated under reduced pressure and purified by column chromatography (dichloromethane: 7N ammonia-methanol, 95:5) to give the titled compound as a colorless solid. Yield: 170 mg (42%); MS APCI+ve 487 (M+H).

¹H NMR δ (CDCl₃) 7.11-7.04 (2H, m), 6.88-6.82 (2H, m), 5.16 (2H, s), 4.24 (2H, t), 3.98 (3H, s), 3.95 (2H, t), 3.67 (3H, s), 3.62-3.56 (2H, m), 3.52 (2H, s), 3.51 (2H, s), 3.33-3.27 (1H, m), 2.84 (2H, t), 2.74 (2H, t), 1.75 (2H, quintet), 1.48 (2H, sextet), 0.96 (3H, t).

(iii) Methyl (3-{[[2-(6-amino-2-butoxy-8-oxo-7,8-dihydro-9H-purin-9-yl)ethyl](2-hydroxyethyl)amino]methyl}phenyl)acetate

Using the compound obtained in the step (ii) (170 mg), the same manner to Example 2-41 step (iii) was conducted to give the titled compound as a colorless solid. Yield: 150 mg (91%); MS APCI+473 ve (M+H).

¹H NMR δ (DMSO d₆) 9.81 (1H, s), 7.09 (1H, t), 7.03-6.98 (3H, m), 6.36 (2H, s), 4.34 (1H, t), 4.05 (2H, t), 3.73 (2H, t), 3.59 (3H, s), 3.57 (2H, s), 3.54 (2H, s), 3.39 (2H, q), 2.73, (2H, t), 2.54 (2H, t), 1.58 (2H, quintet), 1.35 (2H, sextet), 0.89 (3H, t).

EXAMPLE 2-53 Methyl (3-{[[4-(6-amino-2-butoxy-8-oxo-7,8-dihydro-9H-purin-9-yl)butyl](2-hydroxyethyl)amino]methyl}phenyl)acetate

(i) Methyl (3-{[(2-hydroxyethyl)amino]methyl}phenyl)acetate oxalate

Using 2-aminoethanol (2.5 ml), the same manner to Example 2-46 step (i) was conducted to give the titled compound as a colorless solid. Yield: 250 mg (39%).

¹H NMR δ (DMSO d₆) 7.43-7.27 (4H, m), 4.13 (2H, s), 3.70 (2H, s), 3.65 (2H, t), 3.62 (3H, s), 2.94 (2H, t).

(ii) Methyl (3-{[[4-(6-amino-2-butoxy-8-oxo-7,8-dihydro-9H-purin-9-yl)butyl](2-hydroxyethyl)amino]methyl}phenyl)acetate fumarate

A suspension of the compound obtained in Example 2-13 step (i) (200 mg), the compound obtained in the step (i) (170 mg) and potassium carbonate (300 mg) in dimethylformamide (5 ml) was stirred at 70° C. overnight, and to the resultant was added water. The mixture was extracted with ethyl acetate and the organic layer was dried and concentrated under reduced pressure. The residue was dissolved in methanol (10 ml) and 4N hydrochloric acid-dioxane (5 ml) was added thereto and the mixture was stirred at room temperature for 20 hours and concentrated under reduced pressure and purified by RPHPLC. Then the resultant was made into fumarate by using 1N fumaric acid in ethanol to give the titled compound. Yield: 19 mg (6%); MS APCI+501ve (M+H).

¹H NMR δ (DMSO d₆) 9.86 (1H, s), 7.25-7.09 (4H, m), 6.61 (2H, s), 6.39 (2H, s), 4.13 (2H, t), 3.65-3.61 (4H, m), 3.59 (3H, s), 3.56 (2H, s), 3.44 (2H, t), 2.49-2.45 (2H, m), 1.63 (4H, quintet), 1.45-1.32 (4H, m), 0.90 (3H, t).

EXAMPLE 3 Synthesis of 2-butoxy-8-oxo-9-[2-(2-methoxycarbonylphenoxy)ethyl]adenine

The titled compound was obtained by the same manner to Example 1.

¹H NMR (DMSO-d₆) δ 9.91 (1H, brs), 7.55 (1H, dd, J=1.7, 7.6 Hz), 7.48 (1H, dt, J=1.7, 8.2 Hz), 7.17 (1H, d, J=8.2 Hz), 7.00 (1H, t, J=7.6 Hz), 6.41 (2H, brs), 4.35 (2H, t, J=5.7 Hz), 4.09 (2H, t, J=6.6 Hz), 4.05 (2H, t, J=5.7 Hz), 3.61 (3H, s), 1.64-1.58 (2H, m), 1.42-1.37 (2H, m), 0.89 (3H, t, J=7.4 Hz).

EXAMPLE 4 Synthesis of 2-butoxy-8-oxo-9-[2-(2-methoxycarbonylmethylphenoxy)ethyl]adenine

The titled compound was obtained by the same method as Example 1.

¹H NMR (DMSO-d₆) δ 9.89 (1H, brs), 7.19 (1H, dt, J=1.7, 8.1 Hz), 7.11 (1H, dd, J=1.5, 7.4 Hz), 6.98 (1H, d, J=7.6 Hz), 6.86 (1H, t, J=7.6 Hz), 6.41 (2H, brs), 4.23 (2H, t, J=5.7 Hz), 4.12 (2H, t, J=6.6 Hz), 4.03 (2H, t, J=5.7 Hz), 3.47 (2H, s), 3.46 (3H, s), 1.65-1.61 (2H, m), 1.41-1.36 (2H, m), 0.90 (3H, t, J=7.4 Hz).

EXAMPLE 5 Synthesis of 2-butoxy-8-oxo-9-[2-(4-methoxycarbonylphenoxy)ethyl]adenine

The titled compound was obtained by the same method as Example 1.

¹H NMR (DMSO-d₆) δ 9.78 (1H, brs), 7.87 (2H, d, J=8.9 Hz), 6.97 (2H, d, J=8.9 Hz), 6.43 (2H, brs), 4.37 (2H, t, J=5.0 Hz), 4.08-4.02 (4H, m), 3.80 (2H, s), 1.63-1.58 (2H, m), 1.35-1.30 (2H, m), 0.89 (3H, t, J=7.4 Hz).

EXAMPLE 6 Synthesis of 2-butoxy-8-oxo-9-[2-(4-methoxycarbonylmethylphenoxy)ethyl]adenine

The titled compound was obtained by the same method as Example 1.

¹H NMR (DMSO-d₆) δ 9.90 (1H, s), 7.14 (2H, d, J=8.7 Hz), 6.84 (2H, d, J=8.7 Hz), 6.42 (2H, brs), 4.24 (2H, t, J=5.8 Hz), 4.12 (2H, t, J=6.6 Hz), 4.03 (2H, t, J=5.8 Hz), 3.58 (3H, s), 3.57 (2H, s), 1.65-1.61 (2H, m), 1.39-1.34 (2H, m), 0.90 (3H, t, J=7.4 Hz).

EXAMPLE 7 Synthesis of 2-butoxy-8-oxo-9-{2-[4-(2-methoxycarbonylethyl)phenoxy]ethyl}adenine

To 2-butoxy-8-bromo-9-{2-[4-(2-cyanoethyl)phenoxy]ethyl}adenine (948 mg, 2.1 mmol) obtained in Reference Example 16 were added water (20 ml) and 5N potassium hydroxide (20 ml) and the mixture was stirred at 95° C. for 6 hours. The resultant was adjusted to pH 5 with concentrated hydrochloric acid, and then the precipitated solid was collected by filtration. Methanol (25 ml) and sulfuric acid (400 μl) were added thereto, followed by stirring at 90° C. for 4 hours. The reaction solution was neutralized with saturated sodium hydrogencarbonate, and the precipitated solid was collected by filtration to give 750 mg (1.7 mmol) of the titled compound as a white solid. Yield: 85%.

¹H NMR (DMSO-d₆) δ 9.90 (1H, brs), 7.08 (2H, d, J=8.6 Hz), 6.80 (2H, d, J=8.6 Hz), 6.41 (2H, brs), 4.24 (2H, t, J=5.8 Hz), 4.11 (2H, t, J=6.6 Hz), 4.01 (2H, t, J=5.8 Hz), 3.67 (3H, s), 2.76 (2H, t, J=7.6 Hz), 2.55 (2H, t, J=7.6 Hz), 1.64-1.59 (2H, m), 1.41-1.36 (2H, m), 0.90 (3H, t, J=7.4 Hz).

EXAMPLE 8 Synthesis of 2-butoxy-8-oxo-9-[4-(3-methoxycarbonylbenzenesulfonamide)butyl]adenine

To 2-butoxy-8-methoxy-9-[4-(3-methoxycarbonylbenzenesulfonamide)butyl]adenine (64 mg, 0.13 mmol) obtained in Reference Example 22 were added methanol (10 ml) and sulfuric acid (300 μl), and the mixture was stirred at 85° C. for 3 hours. The mixture was neutralized with saturated sodium hydrogencarbonate, diluted with water and the precipitated solid was collected by filtration to give 54 mg (0.11 mmol) of the titled compound as a white solid. Yield: 87%.

¹H NMR (DMSO-d₆) δ 9.82 (1H, s), 8.30 (1H, dd, J=1.4, 1.7 Hz), 8.17 (1H, ddd, J=1.3, 1.4, 7.9 Hz), 8.01 (1H, ddd, J=1.3, 1.7, 7.9), 7.78 (1H, t, J=5.8 Hz), 7.72 (1H, t, J=7.9 Hz), 6.49 (2H, brs), 4.11 (2H, t, J=6.6 Hz), 3.89 (3H, s), 3.58 (2H, t, J=6.7 Hz), 2.77 (2H, dt, J=5.8, 6.6 Hz), 1.64-1.59 (4H, m), 1.41-1.36 (2H, m), 1.33-1.28 (2H, m), 0.89 (3H, t, J=7.4 Hz).

EXAMPLE 9 Synthesis of 2-butoxy-8-oxo-9-[4-(3-methoxycarbonylmethylbenzenesulfonamide)butyl]adenine

To 2-butoxy-8-oxo-9-[4-(3-hydroxycarbonylmethylbenzenesulfonamide)butyl]adenine (100 mg, 0.2 mmol) obtained in Comparison Example 9 were added methanol (15 ml) and sulfuric acid (200 μl) and the mixture was stirred at 80° C. for 3 hours. The mixture was and neutralized with an aqueous ammonium solution, and water was added thereto. Precipitated solid was collected by filtration to give 89 mg (0.2 mmol) of the titled compound, as a white solid. Yield: 91%.

¹H NMR (DMSO-d₆) δ 9.82 (1H, s), 7.68 (1H, s), 7.66-7.64 (1H, m), 7.59 (1H, t, J=5.8 Hz), 7.52-7.50 (1H, m), 6.40 (2H, brs), 4.12 (2H, t, J=6.6 Hz), 3.81 (3H, s), 3.59 (2H, t, J=6.6 Hz), 2.75 (2H, dt, J=5.8, 6.6 Hz), 1.65-1.58 (4H, m), 1.40-1.34 (2H, m), 1.36-1.29 (2H, m), 0.91 (3H, t, J=7.4 Hz).

EXAMPLE 10 Synthesis of 2-butoxy-8-oxo-9-[4-(3-methoxycarbonylphenylaminocarbonylamino)butyl]adenine

The titled compound was obtained by the same method as Example 8.

¹H NMR (DMSO-d₆) δ 9.85 (1H, brs), 8.67 (1H, s), 8.10 (1H, dd, J=1.5, 2.2 Hz), 7.56 (1H, ddd, J=1.0, 2.2, 8.2 Hz), 7.47 (1H, ddd, J=1.0, 1.5, 7.6 Hz), 7.34 (1H, dd, J=7.6, 8.2 Hz), 6.40 (2H, brs), 6.17 (1H, t, J=5.7 Hz), 4.13 (2H, t, J=6.6 Hz), 3.83 (3H, s), 3.67 (2H, t, J=6.8 Hz), 3.10 (2H, dt, J=5.7, 6.6 Hz), 1.69-1.63 (2H, m), 1.64-1.59 (2H, m), 1.44-1.37 (2H, m), 1.40-1.35 (2H, m), 0.88 (3H, t, J=7.4 Hz).

EXAMPLE 11 Synthesis of 2-butoxy-8-oxo-9-[4-(3-methoxycarbonylmethylphenylaminocarbonylamino)butyl]adenine

To a solution of 2-butoxy-8-methoxy-9-[4-(3-hydroxymethylphenylaminocarbonylamino)butyl]adenine (300 mg, 0.66 mmol) obtained in Reference Example 27 in chloroform (7 ml) were added under ice-cooling triethylamine (1.08 ml, 7.86 mmol) and thionyl chloride (143 μl, 3.94 mmol), and the mixture was stirred for 5 minutes. Saturated sodium hydrogencarbonate was added thereto, and the mixture was diluted with water and extracted with chloroform (methanol 5%). The organic layer was washed with water and saturated brine, dried over sodium sulfate, and concentrated under reduced pressure. The residue was dissolved in DMF 10 ml, and sodium cyanide 96 mg (2.0 mmol) was added thereto at room temperature, followed by stirring at room temperature for 22 hours. To the reaction mixture was added saturated ammonium chloride, and the mixture was concentrated under reduced pressure. To the residue was added water and the mixture was extracted with chloroform (methanol 5%). The organic layer was washed with saturated brine, dried over sodium sulfate, and concentrated under reduced pressure. To the residue were added methanol (5 ml) and 5N potassium hydroxide (5 ml), followed by stirring at 90° C. for 6.5 hours. The resultant was neutralized with concentrated hydrochloric acid and concentrated under reduced pressure. To the residues were added methanol (20 ml) and the mixture was concentrated sulfuric acid (0.3 ml), followed by stirring at 90° C. for 2 hours. After cooling, the resultant was neutralized with an aqueous ammonium solution, and the precipitated solid was collected by filtration to give 140 mg (0.29 mmol) of the titled compound as a white solid. Yield: 44%.

¹H NMR (DMSO-d₆) δ 9.85 (1H, s), 8.39 (1H, s), 7.34 (1H, s), 7.26 (1H, d, J=8.2 Hz), 7.14 (1H, dd, J=7.5, 8.2 Hz), 6.76 (1H, d, J=7.5 Hz), 6.40 (2H, brs), 6.10 (1H, t, J=5.7 Hz), 4.13 (2H, t, J=6.6 Hz), 3.60 (3H, s), 3.58 (2H, s), 3.08 (2H, dt, J=5.7, 6.6 Hz), 1.68-1.60 (4H, m), 1.40-1.32 (4H, m), 0.89 (3H, t, J=7.4 Hz).

EXAMPLE 12 Interferon Inducing Activity of Rat Spleen Cells (in vitro)

Spleen was removed from CD(SD)IGS rat (male; 8-10 weeks old). A suspension of spleen cells of 1×10⁷ cells/ml was prepared by using non serum MEN broth, and each 0.1 ml thereof was poured in a well of 96-well microplate. The test sample diluted with the broth (containing 0.2% DMSO) in each 0.1 ml was poured in the well and incubated in 5% CO₂ incubator at 37° C. for 24 hours. The culture broth was centrifuged to give a supernatant of the incubation. The interferon activity in the supernatant of the broth was quantitatively measured by the partially-improved bioassay method described in A. Armstrong, Methods in Enzymology 78, 381-7. Namely after mouse fibroblast L929 in 4×10⁴ cells/50 μl was cultured in a 96-well culture plate for 7 hour, thereto was added 50 μl of the diluted culture supernatant and the mixture was further cultured for 17 hours. After the cultured broth in each well was removed, each 100 μl of vesicular stomatitis virus was added to each well and the effect of the cell denaturation 44 hours after the virus infection was confirmed by the neutral red stain. In Table 30, an interferon inducing activity (minimum effective concentration) on each compound was shown.

TABLE 30 Minimum effective Compound concentration (nM) Example 1 0.3 Example 2 3 Example 3 1 Example 4 1 Example 6 10 Example 8 3 Example 9 3 Example 10 1 Example 11 10 Comparison Example 1 10 Comparison Example 2 30 Comparison Example 3 100 Comparison Example 4 100 Comparison Example 6 100 Comparison Example 8 100 Comparison Example 9 300 Comparison Example 10 300 Comparison Example 11 100

EXAMPLE 13 Metabolic Stability Test Using Human Plasma

Plasma was prepared from fresh human blood and the test compound (containing 1% DMSO) of the final concentration of 1 μM was added thereto.

After a metabolic reaction by plasma esterase was conducted at 37° C. for 15 minutes, the test compound was extracted with ethyl acetate, and quantitatively analyzed by reverse phase HPLC. The metabolic stability of the test compound was shown by the residual amount (%) per the concentration of pre-metabolization as 100%. The result was shown in Table 31.

TABLE 31 Compound Residual rate (%) Example 2 1.4 Example 9 <1.0

EXAMPLE 14 Metabolic Stability Test on Rat Liver S9

The reaction using liver S9 of rat was conducted on a 96-well plate by using a screening robot by Tecan Company. S9 solution was prepared by adding 250 mM Kpi (ph 7.4) 20 ml and deionized water 20 ml to 10 ml of liver S9 of rat, a Cofactor solution was prepared by dissolving NADPH 220 mg in deionized water 40.5 ml (Final 6 mM), and IS (Internal Standard) solution was prepared by adding IS solution (1 mM DMSO solution) 300 μl to acetonitrile 30 ml (100 times dilution). The test compound (1 μM DMSO solution) was dissolved in an incubator at 37° C. After each 35 μL was poured in a 96-well plate (24 samples/plate), plates (sample plates, 96-well plates for dilution, each Deep well plates for the reaction and the recovery, plates for extraction of a solid phase) and reagents (S9 solution, Cofactor solution, IS (Internal Standard) solution, Stop solution, acetonitrile for elution) were set to the specified position in the booth of the robot and the reaction started (the concentration of the test compounds was 1 μM). Incubation was conducted under shaking at 37° C., the solid phase was extracted (at the same time, the internal standard for analysis was added). To the recovered samples 200 μL/well was added 50 μL of acetonitrile per each well, and to 2 plates of FALCON Deep well were poured 100 μL/well of the solution per well. By subjecting to the LC/MS analysis, the chromatography of the test compound and the internal standard were described and the peak area was calculated. And then, the stability (residual rate after reaction) was calculated. The result was shown in Table 32.

TABLE 32 Compound Residual rate (%) Example 1 0 Example 2 1 Example 3 0 Example 4 0 Example 5 0 Example 6 0 Example 7 0 Example 8 0 Example 9 0 Example 10 1

COMPARISON EXAMPLE 1 Synthesis of 2-butoxy-8-oxo-9-[2-(3-hydroxycarbonylphenoxy)ethyl]adenine

To 2-butoxy-8-oxo-9-[2-(3-methoxycarbonylphenoxy)ethyl]adenine (50 mg, 0.12 mmol) obtained in Example 1 were added methanol (2.5 ml) and 2.5N potassium hydroxide (5 m), and the mixture was stirred at 85° C. for 4.5 hours. After cooling, water was added and the resultant was made to pH 5 by concentrated hydrochloric acid. The precipitated crystal was collected by filtration to give 49 mg (0.12 mmol) of the titled compound as a white solid. Yield: 100%.

¹H NMR (DMSO-d₆) δ 13.02 (1H, br), 10.23 (1H, brs), 7.51 (1H, dd, J=1.2, 8.8 Hz), 7.38-7.36 (2H, m), 7.14 (1H, dd, J=0.8, 2.6 Hz), 6.57 (2H, brs), 4.32 (2H, t, J=5.7 Hz), 4.11-4.04 (4H, m), 1.65-1.60 (2H, m), 1.40-1.35 (2H, m), 0.89 (3H, t, J=7.4 Hz).

COMPARISON EXAMPLE 2 Synthesis of 2-butoxy-8-oxo-9-[2-(3-hydroxycarbonylmethylphenoxy)ethyl]adenine)

From 2-butoxy-8-oxo-9-[2-(3-methoxycarbonylmethylphenoxy)ethyl]adenine 15 mg (0.04 mmol) obtained in Example 2, 10 mg (0.03 mmol) of the titled compound was obtained as a white solid by the same method as Comparison Example 1. Yield: 70%.

¹H NMR (DMSO-d₆) δ 12.43 (1H, br), 9.93 (1H, s), 7.22-7.20 (1H, m), 6.81-7.78 (3H, m), 6.45 (2H, br), 4.24 (2H, t, J=5.8 Hz), 4.12 (2H, t, J=6.6 Hz), 4.04 (2H, t, J=5.8 Hz), 3.50 (2H, s), 1.65-1.60 (2H, m), 1.39-1.35 (2H, m), 0.90 (3H, t, J=7.4 Hz).

COMPARISON EXAMPLE 3 Synthesis of 2-butoxy-8-oxo-9-[2-(2-hydroxycarbonylphenoxy)ethyl]adenine

The titled compound was obtained by the same method as Comparison Example 1.

¹H NMR (DMSO-d₆) δ 12.46 (1H, br), 10.03 (1H, brs), 7.61 (1H, dd, J=1.7, 7.6 Hz), 7.45 (1H, dt, J=1.7, 8.2 Hz), 7.16 (1H, d, J=8.2 Hz), 7.00 (1H, t, J=7.6 Hz), 6.49 (2H, brs), 4.33 (2H, t, J=5.7 Hz), 4.09 (2H, t, J=6.6 Hz), 4.04 (2H, t, J=5.7 Hz), 1.64-1.59 (2H, m), 1.39-1.34 (2H, m), 0.89 (3H, t, J=7.4 Hz).

COMPARISON EXAMPLE 4 Synthesis of 2-butoxy-8-oxo-9-[2-(2-hydroxycarbonylmethylphenoxy)ethyl]adenine

The titled compound was obtained by the same method as Comparison Example 1.

¹H NMR (DMSO-d₆) δ 12.17 (1H, br), 10.35 (1H, br), 7.16-7.14 (1H, m), 6.97 (1H, d, J=7.6 Hz), 6.86 (1H, d, J=7.6 Hz), 6.58 (2H, brs), 4.21 (2H, t, J=5.7 Hz), 4.11 (2H, t, J=6.6 Hz), 4.02 (2H, t, J=5.7 Hz), 3.40 (2H, s), 1.65-1.60 (2H, m), 1.39-1.35 (2H, m), 0.88 (3H, t, J=7.4 Hz).

COMPARISON EXAMPLE 5 Synthesis of 2-butoxy-8-oxo-9-[2-(4-hydroxycarbonylphenoxy)ethyl]adenine

The titled compound was obtained by the same method as Comparison Example 1.

¹H NMR (DMSO-d₆) δ 12.62 (1H, br), 9.47 (1H, brs), 7.84 (2H, d, J=8.7 Hz), 6.97 (2H, d, J=8.7 Hz), 6.35 (2H, brs), 4.36 (2H, t, J=5.0 Hz), 4.11-4.08 (4H, m), 1.65-1.60 (2H, m), 1.37-1.32 (2H, m), 0.90 (3H, t, J=7.4 Hz).

COMPARISON EXAMPLE 6 Synthesis of 2-butoxy-8-oxo-9-[2-(4-methoxycarbonylmethylphenoxy)ethyl]adenine

The titled compound was obtained by the same method as Comparison Example 1.

¹H NMR (DMSO-d₆) δ 12.25 (2H, br), 9.97 (1H, br), 7.12 (2H, d, J=8.7 Hz), 6.83 (2H, d, J=8.7 Hz), 6.44 (2H, brs), 4.24 (2H, t, J=5.8 Hz), 4.12 (2H, t, J=6.6 Hz), 4.03 (2H, t, J=5.8 Hz), 3.45 (2H, s), 1.65-1.60 (2H, m), 1.40-1.35 (2H, m), 0.90 (3H, t, J=7.4 Hz).

COMPARISON EXAMPLE 7 Synthesis of 2-butoxy-8-oxo-9-{2-[4-(2-hydroxycarbonylethyl)phenoxy]ethyl}adenine

The titled compound was obtained by the same method as Comparison Example 1.

¹H NMR (DMSO-d₆) δ 12.12 (1H, br), 10.03 (1H, brs), 7.09 (2H, d, J=8.6 Hz), 6.79 (2H, d, J=8.6 Hz), 6.47 (2H, brs), 4.22 (2H, t, J=5.8 Hz), 4.11 (2H, t, J=6.6 Hz), 4.04 (2H, t, J=5.8 Hz), 2.72 (2H, t, J=7.6 Hz), 2.43 (2H, t, J=7.6 Hz), 1.64-1.59 (2H, m), 1.41-1.36 (2H, m), 0.90 (3H, t, J=7.4 Hz).

COMPARISON EXAMPLE 8 Synthesis of 2-butoxy-8-oxo-9-[4-(3-hydroxycarbonylbenzenesulfonamide)butyl]adenine

The titled compound was obtained by the same method as Comparison Example 1.

¹H NMR (DMSO-d₆) δ 13.59 (1H, br), 10.06 (1H, brs), 8.29 (1H, dd, J=1.4, 1.7 Hz), 8.13 (1H, ddd, J=1.3, 1.4, 7.9 Hz), 7.92 (1H, ddd, J=1.3, 1.7, 7.9 Hz), 7.71 (1H, t, J=5.8 Hz), 7.66 (1H, t, J=7.9 Hz), 6.47 (2H, brs), 4.11 (2H, t, J=6.6 Hz), 3.60 (2H, t, J=6.6 Hz), 2.75 (2H, dt, J=5.8, 6.6 Hz), 1.63-1.58 (4H, m), 1.38-1.32 (4H, m), 0.89 (3H, t, J=7.4 Hz).

COMPARISON EXAMPLE 9 Synthesis of 2-butoxy-8-oxo-9-[4-(3-hydroxycarbonylmethylbenzenesulfonamide)butyl]adenine

To 2-butoxy-8-methoxy-9-[4-(3-cyanomethylbenzenesulfonamide)butyl]adenine (190 mg, 0.4 mmol) obtained in Reference Example 25 were added methanol (3 ml) and 3.7N potassium hydroxide (3 ml) and the mixture was stirred at 90° C. for 3 hours. The resultant was adjusted to pH 5 by 1N hydrochloric acid, and the precipitated solid was collected by filtration. The obtained solid was dissolved in 1N sodium hydroxide and washed with chloroform. The aqueous layer was adjusted to pH 5 with 1N aqueous hydrochloric acid solution, and the precipitated solid was collected by filtration to give 145 mg (0.3 mmol) of the titled compound as a white solid. Yield: 73%.

¹H NMR (DMSO-d₆) δ 12.48 (1H, brs), 9.98 (1H, s), 7.68 (1H, s), 7.64-7.62 (1H, m), 7.58 (1H, t, J=5.9 Hz), 7.50-7.48 (1H, m), 7.48 (1H, d, J=1.0 Hz), 6.48 (2H, brs), 4.12 (2H, t, J=6.6 Hz), 3.69 (2H, brs), 3.59 (2H, t, J=6.6 Hz), 2.75 (2H, dt, J=5.9, 6.6 Hz), 1.65-1.58 (4H, m), 1.40-1.36 (2H, m), 1.35-1.29 (2H, m), 0.91 (3H, t, J=7.4 Hz).

COMPARISON EXAMPLE 10 Synthesis of 2-butoxy-8-oxo-9-[4-(3-hydroxycarbonylphenylaminocarbonylamino)butyl]adenine

The titled compound was obtained by the same method as Comparison Example 1.

¹H NMR (DMSO-d₆) δ 12.82 (1H, brs), 9.86 (1H, s), 8.61 (1H, s), 8.01 (1H, dd, J=1.5, 2.2 Hz), 7.57 (1H, ddd, J=1.0, 2.2, 8.2 Hz), 7.45 (1H, ddd, J=1.0, 1.5, 7.6 Hz), 7.31 (1H, dd, J=7.6, 8.2 Hz), 6.41 (2H, brs), 6.16 (1H, t, J=5.7 Hz), 4.13 (2H, t, J=6.6 Hz), 3.68 (2H, t, J=6.8 Hz), 3.10 (2H, dt, J=5.7, 6.6 Hz), 1.70-1.64 (2H, m), 1.64-1.59 (2H, m), 1.44-1.37 (2H, m), 1.39-1.33 (2H, m), 0.88 (3H, t, J=7.4 Hz).

COMPARISON EXAMPLE 11 Synthesis of 2-butoxy-8-oxo-9-[4-(3-hydroxycarbonylmethylphenylaminocarbonylamino)butyl]adenine

The titled compound was obtained by the same method as Comparison Example 1.

¹H NMR (DMSO-d₆) δ 12.29 (1H, br), 9.90 (1H, s), 8.38 (1H, s), 7.28 (1H, s), 7.25 (1H, d, J=8.2 Hz), 7.13 (1H, dd, J=7.5, 8.2 Hz), 6.76 (1H, d, J=7.5 Hz), 6.41 (2H, brs), 6.10 (1H, t, J=5.7 Hz), 4.14 (2H, t, J=6.6 Hz), 3.68 (2H, t, J=6.8 Hz), 3.46 (2H, s), 3.08 (2H, dt, J=5.7, 6.6 Hz), 1.68-1.59 (4H, m), 1.42-1.35 (4H, m), 0.89 (3H, t, J=7.4 Hz).

REFERENCE EXAMPLE 1 Synthesis of methyl 3-(2-bromoethoxy)benzoate

To a solution of methyl 3-hydroxybenzoate (2.00 g, 13.1 mmol) in acetone (50 ml) were added potassium carbonate (3.18 g, 23.0 mmol) and 1,2-dibromoethane (6.4 ml, 74.1 mmol) and the mixture was stirred at 85° C. for 24 hours. After cooling, the resultant was concentrated under reduced pressure. To the residue was added 75 ml of water and the mixture was extracted with ethyl acetate. The organic layer was washed with 1N aqueous sodium hydroxide solution, water and saturated brine in this order, dried over sodium sulfate and concentrated under reduced pressure. The residue was purified by silica gel column chromatography to give 1.79 g (6.9 mmol) of the titled compound as an yellow oil. Yield: 53%.

¹H NMR (CDCl₃) δ 7.67 (1H, dt, J=1.5, 7.8 Hz), 7.56 (1H, dd, J=1.5, 2.6 Hz), 7.36 (1H, t, J=7.8 Hz), 7.15-7.13 (1H, m), 4.34 (2H, t, J=6.2 Hz), 3.92 (3H, s), 3.66 (2H, t, J=6.2 Hz).

REFERENCE EXAMPLE 2 Synthesis of 2-butoxy-9-[2-(3-methoxycarbonylphenoxy)ethyl]adenine

To 2-butoxyadenine (727 mg, 3.5 mmol) and potassium carbonate (727 mg, 5.3 mmol) was added DMF (35 ml), and the mixture was stirred at 70° C. for 2 hours. Then a solution of methyl 3-(2-bromoethoxy)benzoate obtained in Reference Example 1 (1.0 g, 3.9 mmol) in DMF (2 ml) was added thereto under ice-cooling, followed by stirring at room temperature for 3 hours. The solvent was removed under reduced pressure, and to the residue was added water. The mixture was neutralized with concentrated hydrochloric acid and extracted with chloroform (methanol 5%). The organic layer was washed with water and saturated brine, dried over sodium sulfate and concentrated under reduced pressure. The residue was purified by silica gel column chromatography to give, as white crystal, 1.1 g (2.9 mmol) of the titled compound. Yield: 81%.

¹H NMR (CDCl₃) δ 7.83 (1H, s), 7.65 (1H, dt, J=1.5, 8.0 Hz), 7.51 (1H, dd, J=1.5, 2.6 Hz), 7.31 (1H, t, J=8.0 Hz), 7.07 (1H, ddd, J=0.9, 2.6, 8.0 Hz), 5.88 (2H, br), 4.53 (2H, t, J=4.8 Hz), 4.33 (4H, m), 3.90 (3H, s), 1.83-1.73 (2H, m), 1.53-1.47 (2H, m), 0.97 (3H, t, J=7.4 Hz).

REFERENCE EXAMPLE 3 Synthesis of 2-butoxy-9-[2-(3-methoxycarbonylmethylphenoxy)ethyl]adenine

To a suspension of lithium aluminum hydride (150 mg, 4.0 mmol) in THF (15 ml) was added a solution of 2-butoxy-9-[2-(3-methoxycarbonylphenoxy)ethyl]adenine (540 mg, 1.4 mmol) obtained in Reference Example 2 in THF (5 ml) under ice-cooling, and the mixture was stirred at room temperature for 3 hours. 1N Aqueous sodium hydroxide solution was added thereto, followed by filtration through celite pad and concentration under reduced pressure. The residue was dissolved in chloroform (10 ml), and thionyl chloride (336 μl, 4.62 mmol) was added thereto at room temperature, followed by stirring at 60° C. for 10 minutes. To the reaction mixture was added 1N aqueous sodium hydroxide solution, and the mixture was diluted with water and extracted with chloroform (methanol 5%). The organic layer was washed with water and brine, dried over sodium sulfate and concentrated under reduced pressure to give chloromethyl product as a pale yellow crystal, 380 mg. To a solution of the chloromethyl product (380 mg) in DMF (10 ml) was added sodium cyanide (99 mg, 2.02 mmol) at room temperature, followed by stirring at room temperature for 1 hour. To the reaction mixture was added saturated ammonium chloride and the mixture was concentrated under reduced pressure. To the residue was added water and the mixture was extracted with chloroform (methanol 5%). The organic layer was washed with water and saturated brine, dried over sodium sulfate and concentrated under reduced pressure. To the residue were added methanol (7 ml) and 5N aqueous potassium hydroxide solution (7 ml) and the mixture was stirred at 95° C. for 3.5 hours. The reaction solution was neutralized with concentrated hydrochloric acid, and concentrated under reduced pressure. Methanol (20 ml) and concentrated sulfuric acid (0.3 ml) were added thereto, followed by stirring at 90° C. for 3.5 hours. After cooling, the resultant was concentrated under reduced pressure, and to the residue was added water. The solution was extracted with chloroform (methanol 5%). The organic layer was washed with water and saturated brine, dried over sodium sulfate and concentrated under reduced pressure. The residue was purified by silica gel column chromatography to give 160 mg (0.40 mmol) of the titled compound as a pale yellow oil. Yield: 29%.

¹H NMR (DMSO-d₆) δ 7.22 (1H, t, J=7.8 Hz), 6.87 (1H, d, J=7.8 Hz), 6.80-6.77 (2H, m), 5.51 (2H, brs), 4.56 (2H, t, J=4.8 Hz), 4.31-4.27 (4H, m), 3.68 (3H, s), 3.58 (2H, s), 1.82-1.78 (2H, m), 1.53-1.48 (2H, m), 0.97 (3H, t, J=7.4 Hz).

REFERENCE EXAMPLE 4 Synthesis of methyl 2-(2-bromoehyoxy)benzoate

The titled compound was obtained by the same method as Reference Example 1.

¹H NMR (CDCl₃) δ 7.60 (1H, dd, J=1.6, 7.6 Hz), 7.46-7.44 (1H, m), 7.04-7.02 (1H, m), 6.97 (1H, dt, 0.6, 8.3 Hz), 4.36 (2H, t, J=6.5 Hz), 3.90 (3H, s), 3.68 (2H, t, J=6.5 Hz).

REFERENCE EXAMPLE 5 Synthesis of 2-butoxy-9-[2-(2-methoxycarbonylphenoxy)ethyl]adenine

The titled compound was obtained by the same method as Reference Example 2.

¹H NMR (DMSO-d₆) δ 8.01 (1H, s), 7.64 (1H, dd, J=1.8, 7.7 Hz), 7.51-7.50 (1H, m), 7.19 (2H, brs), 7.15 (1H, d, J=8.1 Hz), 7.02-7.00 (1H, m), 4.47-4.42 (2H, m), 4.38-4.34 (2H, m), 4.18 (2H, t, J=6.6 Hz), 3.73 (3H, s), 1.67-1.76 (2H, m), 1.41-1.38 (2H, m), 0.89 (3H, t, J=7.4 Hz).

REFERENCE EXAMPLE 6 Synthesis of 2-butoxy-9-[2-(2-hydroxymethylphenoxy)ethyl]adenine

To a suspension of lithium aluminum hydride (74 mg, 1.9 mmol) in THF (10 ml) was added a solution of 2-butoxy-9-[2-(2-methoxycarbonylphenoxy)ethyl]adenine (500 mg, 1.4 mmol) obtained by Reference Example 5 in THF (2 ml) under ice-cooling, and the mixture was stirred at room temperature for 1 hour. 1N Aqueous sodium hydroxide solution was added thereto, followed by filtration through celite pad, and the filtrate was concentrated under reduced pressure to give 500 mg (1.4 mmol) of the titled compound as a white solid. Yield: 99%.

¹H NMR (DMSO-d₆) δ 7.98 (1H, s), 7.32 (1H, d, J=7.6 Hz), 7.18 (2H, brs), 7.15-7.13 (1H, m), 6.94-6.92 (1H, m), 6.91-6.89 (1H, m), 4.96 (1H, t, 4.9 Hz), 4.44 (2H, t, J=5.1 Hz), 4.33 (2H, d, J=4.9 Hz), 4.29 (2H, t, J=5.1 Hz), 4.19 (2H, t, J=6.6 Hz), 1.67-1.62 (2H, m), 1.41-1.37 (2H, m), 0.92 (3H, t, J=7.4 Hz).

REFERENCE EXAMPLE 7 Synthesis of 2-butoxy-9-[2-(2-chloromethylphenoxy)ethyl]adenine

To a solution of 2-butoxy-9-[2-(2-hydroxymethylphenoxy)ethyl]adenine (500 ml, 1.4 mmol) obtained in Reference Example 6 in chloroform (10 ml) was added thionyl chloride (510 μl, 7.0 mmol) at room temperature, and the mixture was stirred at 60° C. for 1 hour. 1N Aqueous sodium hydroxide solution was added to the resultant, followed by dilution with water and extraction with chloroform (methanol 5%). The organic layer was washed with water and saturated brine, dried over sodium sulfate and concentrated under reduced pressure to give 529 mg (1.3 mmol) of the titled compound as a pale yellow solid. Yield: 93%.

¹H NMR (DMSO-d₆) δ 8.07 (1H, s), 7.33-7.31 (4H, m), 7.04 (1H, d, J=8.1 Hz), 6.93 (1H, t, J=7.2 Hz), 4.59 (2H, s), 4.50-4.48 (2H, m), 4.38-4.36 (2H, m), 4.21 (2H, t, J=6.6 Hz), 1.69-1.64 (2H, m), 1.45-1.40 (2H, m), 0.92 (3H, t, J=7.4 Hz).

REFERENCE EXAMPLE 8 Synthesis of 2-butoxy-9-[2-(2-cyanomethylphenoxy)ethyl]adenine

To a solution of 2-butoxy-9-[2-(2-chloromethylphenoxy)ethyl]adenine (529 mg, 1.3 mmol) obtained in Reference Example 7 in DMF (14 ml) was added sodium cyanide (207 mg, 4.2 mmol) at room temperature and the mixture was stirred at room temperature for 1 hour. Saturated ammonium chloride was added thereto and concentrated under reduced pressure. To the residue was added water and the solution was extracted with chloroform (methanol 5%). The organic layer was washed with water and an aqueous saline solution, dried over sodium sulfate and concentrated under reduced pressure to give 436 mg (1.2 mmol) of the titled compound as pale a yellow solid. Yield: 84%.

¹H NMR (DMSO-d₆) δ 8.32 (1H, s), 7.32-7.30 (2H, m), 7.20 (2H, br), 7.06 (1H, d, J=8.0 Hz), 7.97 (1H, t, J=7.1 Hz), 4.47 (2H, t, J=5.0 Hz), 4.36 (2H, t, J=5.0 Hz), 4.19 (2H, t, J=6.6 Hz), 3.73 (2H, s), 1.69-1.64 (2H, m), 1.45-1.40 (2H, m), 0.92 (3H, t, J=7.4 Hz).

REFERENCE EXAMPLE 9 Synthesis of 2-butoxy-9-[2-(2-methoxycarbonylmethylphenoxy)ethyl]adenine

To 2-butoxy-9-[2-(2-cyanomethylphenoxy)ethyl]adenine (436 mg, 1.2 mmol) obtained in Reference Example 8 were added methanol (12 ml) and 5N aqueous potassium hydroxide solution (12 ml), and the mixture was heated at 95° C. for 6.5 hours. The reaction solution was neutralized with concentrated hydrochloric acid and the precipitated solid was collected by filtration. Methanol (15 ml) and concentrated sulfuric acid (0.3 ml) were added thereto and the mixture was stirred at 75° C. for 5 hours. After cooling, the resultant was neutralized with saturated sodium hydrogencarbonate solution, and methanol was removed by distillation. The precipitated solid was collected by filtration to give 384 mg (1.0 mmol) of the titled compound as a white solid. Yield: 81%.

¹H NMR (DMSO-d₆) δ 8.01 (1H, s), 7.22-7.20 (3H, m), 7.14 (1H, dd, J=1.6, 7.4 Hz), 6.98 (1H, d, J=6.5 Hz), 6.88 (1H, dt, J=0.8, 7.4 Hz), 4.41 (2H, t, J=5.0 Hz), 4.28 (2H, t, J=5.0 Hz), 4.19 (2H, t, J=6.6 Hz), 3.53 (3H, s), 3.50 (2H, s), 1.69-1.64 (2H, m), 1.42-1.37 (2H, m), 0.90 (3H, t, J=7.4 Hz).

REFERENCE EXAMPLE 10 Synthesis of methyl 4-(2-bromoethoxy)benzoate

The titled compound was obtained by the same method as Reference Example 1.

¹H NMR (CDCl₃) δ 7.99 (2H, d, J=9.0 Hz), 6.92 (2H, d, J=9.0), 4.35 (2H, t, J=6.2 Hz), 3.89 (3H, s), 3.66 (2H, t, J=6.2 Hz).

REFERENCE EXAMPLE 11 Synthesis of 2-butoxy-9-[2-(4-methoxycarbonylphenoxy)ethyl]adenine

The titled compound was obtained by the same method as Reference Example 2.

¹H NMR (DMSO-d₆) δ 7.97 (2H, d, J=8.6 Hz), 7.27 (1H, s), 6.90 (2H, d, J=8.6 Hz), 5.84 (2H, brs), 4.54 (2H, m), 4.38-4.34 (2H, m), 4.18 (2H, t, J=6.6 Hz), 3.73 (3H, s), 1.67-1.76 (2H, m), 1.41-1.38 (2H, m), 0.89 (3H, t, J=7.4 Hz).

REFERENCE EXAMPLE 12 Synthesis of methyl 4-(2-bromoethoxy)phenylacetate

The titled compound was obtained by the same method as Reference Example 1.

¹H NMR (CDCl₃) δ 7.21 (2H, d, J=8.7 Hz), 6.88 (2H, d, J=8.7 Hz), 4.30 (2H, t, J=6.3 Hz), 3.71 (3H, s), 3.65 (2H, t, J=6.3 Hz), 3.59 (2H, s).

REFERENCE EXAMPLE 13 Synthesis of 2-butoxy-9-[2-(4-methoxycarbonylmethylphenoxy)ethyl]adenine

The titled compound was obtained by the same method as Reference Example 2.

¹H NMR (DMSO-d₆) δ 7.96 (1H, s), 7.18 (2H, brs), 7.14 (2H, d, J=8.7 Hz), 6.86 (2H, d, J=8.7 Hz), 4.42 (2H, t, J=5.4 Hz), 4.32 (2H, t, J=5.4 Hz), 4.19 (2H, t, J=6.6 Hz), 3.58 (5H, s), 1.68-1.63 (2H, m), 1.41-1.36 (2H, m), 0.91 (3H, t, J=7.4 Hz).

REFERENCE EXAMPLE 14 Synthesis of 2-butoxy-9-{2-[4-(2-hydroxyethyl)phenoxy]ethyl}adenine

The titled compound was obtained by the same method as Reference Example 6.

¹H NMR (DMSO-d₆) δ 7.95 (1H, s), 7.18 (2H, brs), 7.08 (2H, d, J=8.6 Hz), 6.81 (2H, d, J=8.6 Hz), 4.58 (2H, t, J=5.3 Hz), 4.40 (2H, t, J=5.2 Hz), 4.29 (2H, t, J=5.2 Hz), 4.19 (2H, t, J=6.6 Hz), 3.51 (2H, dt, J=5.3, 7.2 Hz), 2.62 (2H, t, J=7.2 Hz), 1.67-1.62 (2H, m), 1.40-1.35 (2H, m), 0.91 (3H, t, J=7.4 Hz).

REFERENCE EXAMPLE 15 Synthesis of 2-butoxy-9-{2-[4-(2-chloroethyl)phenoxy]ethyl}adenine

The titled compound was obtained by the same method as Reference Example 7.

¹H NMR (DMSO-d₆) δ 8.05 (1H, s), 7.43 (2H, br), 7.16 (2H, d, J=8.6 Hz), 6.87 (2H, d, J=8.6 Hz), 4.43 (2H, t, J=5.2 Hz), 4.32 (2H, t, J=5.2 Hz), 4.23 (2H, t, J=6.6 Hz), 3.77 (2H, t, J=7.1 Hz), 2.93 (2H, t, J=7.1 Hz), 1.69-1.64 (2H, m), 1.43-1.38 (2H, m), 0.90 (3H, t, J=7.4 Hz).

REFERENCE EXAMPLE 16 Synthesis of 2-butoxy-8-bromo-9-{2-[4-(2-cyanoethyl)phenoxy]ethyl}adenine

To a solution of 2-butoxy-9-{2-[4-(2-chloroethyl)phenoxy]ethyl}adenine (985 mg, 2.6 mmol) obtained in Reference Example 15 in DMF (20 ml) was added sodium cyanide (3085 mg, 7.9 mmol) at room temperature, and the mixture was stirred at room temperature for 18 hours and at 50° C. for 2 hours. 1N Hydrochloric acid was added to the resultant and the mixture was concentrated under educed pressure. To the residue was added water and the mixture was extracted with chloroform (methanol 5%). The organic layer was washed with water and saturated brine, dried over sodium sulfate and concentrated under reduced pressure to give a cyano product. To a solution of the obtained cyano product in chloroform (25 ml) were added sodium acetate (653 mg, 3.6 mmol) and bromine (180 μl, 3.6 mmol) under ice-cooling, followed by stirring at room temperature for 3 hours. Saturated sodium hydrogencarbonate and saturated sodium thiosulfate were added to the resultant, followed by stirring for 10 minutes. The reaction solution was diluted with water and extracted with chloroform (methanol 5%). The organic layer was washed with water and saturated brine, dried over sodium sulfate and concentrated under reduced pressure. The resulting crude crystal was recrystallized from methanol to give 948 mg (2.1 mmol) of the titled compound as a pale yellowish white solid. Yield: 82%.

¹H NMR (DMSO-d₆) δ 7.11 (2H, d, J=8.6 Hz), 6.81 (2H, d, J=8.6 Hz), 5.46 (2H, br), 4.53 (2H, t, J=5.7 Hz), 4.31 (2H, t, J=5.7 Hz), 4.30 (2H, t, J=6.6 Hz), 2.89 (2H, t, J=7.3 Hz), 2.56 (2H, t, J=7.3 Hz), 1.81-1.76 (2H, m), 1.52-1.47 (2H, m), 0.97 (3H, t, J=7.4 Hz).

REFERENCE EXAMPLE 17 Synthesis of (2-butoxy-9-(4-phthalimidobutyl)adenine

The titled compound was obtained by the same method as Reference Example 2.

¹H NMR (DMSO-d₆) δ 7.90 (1H, s), 7.85-7.84 (4H, m), 7.14 (2H, brs), 4.14 (2H, t, J=6.6 Hz), 4.05 (2H, t, J=7.8 Hz), 3.60 (2H, t, J=6.9 Hz), 1.79-1.72 (2H, m), 1.65-1.60 (2H, m), 1.58-1.52 (2H, m), 0.89 (3H, t, J=7.4 Hz).

REFERENCE EXAMPLE 18 Synthesis of (2-butoxy-8-bromo-9-(4-phthalimidobutyl)adenine

To a solution of 2-butoxy-9-(4-phthalimide butyl)adenine (500 mg, 1.2 mmol) obtained in Reference Example 17 in chloroform (13 ml) were added sodium acetate (334 mg, 1.8 mmol) and bromine (92 μl, 1.8 mmol) under ice-cooling, and the mixture was stirred for 2 hours. Saturated sodium hydrogencarbonate and saturated sodium thiosulfate were added to the resultant, followed by stirring for 10 minutes. The reaction solution was diluted with water and extracted with chloroform (methanol 5%). The organic layer was washed with water and saturated brine, dried over sodium sulfate and concentrated under reduced pressure. The residue was purified by silica gel column chromatography to give, as a pale yellow solid, 575 mg (1.2 mmol) of the titled compound. Yield: 96%.

¹H NMR (DMSO-d₆) δ 7.84-7.82 (4H, m), 7.35 (2H, brs), 4.14 (2H, t, J=6.6 Hz), 4.04 (2H, t, J=6.6 Hz), 3.60 (2H, t, J=6.7 Hz), 1.79-1.75 (2H, m), 1.60-1.55 (2H, m), 1.37-1.32 (2H, m), 0.88 (3H, t, J=7.4 Hz).

REFERENCE EXAMPLE 19 Synthesis of 2-butoxy-8-methoxy-9-[4-(2-hydroxycarbonylbenzamide)butyl]adenine

To 2-butoxy-8-bromo-9-(4-phthalimidebutyl)adenine (258 mg, 0.53 mmol) obtained in Reference Example 18 were added methanol (3 ml) and 3N potassium hydroxide (3 ml) and the mixture was stirred at 90° C. for 4 hour. The resultant was adjusted to pH 5 by concentrated hydrochloric acid and the precipitated solid was collected by filtration to give 230 mg (0.51 mmol) of the titled compound as a pale yellow solid. Yield: 95%.

¹H NMR (DMSO-d₆) δ 12.91 (1H, brs), 8.33 (1H, brs), 7.72 (1H, d, J=7.6 Hz), 7.50 (2H, m), 7.35 (1H, d, J=7.4 Hz), 6.80 (2H, brs), 4.15 (2H, t, J=6.5 Hz), 4.05 (3H, s), 3.86 (2H, t, J=6.8 Hz), 3.23-3.17 (2H, m), 1.78-1.73 (2H, m), 1.66-1.61 (2H, m), 1.41-1.36 (2H, m), 0.91 (3H, t, J=7.3 Hz).

REFERENCE EXAMPLE 20 Synthesis of 2-butoxy-8-methoxy-9-(4-aminobutyl)adenine

To a solution of 2-butoxy-8-methoxy-9-{4-(2-hydroxycarbonylbenzamide)butyl}adenine (682 mg, 1.5 mmol) obtained in Reference Example 19 in ethanol (20 ml) was added hydrazine (3 ml) and the mixture was stirred at 90° C. for 4.5 hours. After cooling, the resultant was filtered and the filtrate was concentrated under reduced pressure, followed by addition of water and extraction with chloroform (methanol 5%). The organic layer was washed with water and saturated brine, dried over sodium sulfate and concentrated under reduced pressure. The residue was purified by silica gel column chromatography to give 461 mg (1.5 mmol) of the titled compound as a pale yellow solid. Yield: 99%.

¹H NMR (DMSO-d₆) δ 6.79 (2H, brs), 4.15 (2H, t, J=6.6 Hz), 4.03 (3H, s), 3.82 (2H, t, J=7.0 Hz), 1.73-1.68 (2H, m), 1.67-1.61 (4H, m), 1.43-1.39 (2H, m), 1.28-1.23 (2H, m), 0.92 (3H, t, J=7.4 Hz).

REFERENCE EXAMPLE 21 Synthesis of 3-methoxycarbonylbenzenesulfonyl chloride

To a solution of 3-chlorocarbonylbenzenesulfonyl chloride (5.0 g, 21 mmol) in THF (100 ml) was added methanol 1.7 ml (42 mmol) and the mixture was stirred at room temperature for 13 hours. After the reaction was completed, the resultant was concentrated under reduced pressure to give 5.14 g (21 mmol) of the titled compound as a pale purple solid. Yield: 100%.

¹H NMR (CDCl₃) δ 8.70 (1H, dd, J=1.4, 1.9 Hz), 8.42 (1H, dt, J=1.4, 7.9 Hz), 8.22 (1H, ddd, J=1.2, 1.9, 7.9 Hz), 7.74 (1H, t, J=7.9 Hz), 4.00 (3H, s).

REFERENCE EXAMPLE 22 Synthesis of 2-butoxy-8-methoxy-9-[4-(3-methoxycarbonylbenzenesulfonamide)butyl]adenine

To a solution of 2-butoxy-8-methoxy-9-(4-aminobutyl)adenine (440 mg, 1.4 mmol) obtained in Reference Example 20 in THF (20 ml) were added 3-chlorocarbonylbenzenesulfonyl chloride (502 mg, 2.1 mmol) obtained in Reference Example 22 and triethylamine (312 μl, 2.3 mmol) and the mixture was stirred at room temperature for 1.5 hour. To the resultant was added water, and the mixture was concentrated under reduced pressure and purification by silica gel column chromatography to give 724 mg (1.4 mmol) of the titled compound as a white solid. Yield: 100%.

¹H NMR (DMSO-d₆) δ 8.30 (1H, dd, J=1.4, 1.7 Hz), 8.15 (1H, ddd, J=1.3, 1.4, 7.9 Hz), 8.00 (1H, ddd, J=1.3, 1.7, 7.9 Hz), 7.79 (1H, t, J=5.8 Hz), 7.73 (1H, t, J=7.9 Hz), 6.81 (2H, brs), 4.13 (2H, t, J=6.6 Hz), 4.02 (3H, s), 3.90 (3H, s), 3.77 (1H, t, J=6.7 Hz), 2.75 (1H, dt, J=5.8, 6.6 Hz), 1.65-1.60 (4H, m), 1.42-1.37 (2H, m), 1.27-1.22 (2H, m), 0.89 (3H, t, J=7.4 Hz).

REFERENCE EXAMPLE 23 Synthesis of 2-butoxy-8-methoxy-9-[4-(3-hydroxymethylbenzenesulfonamide)butyl]adenine

The titled compound was obtained by the same method as Reference Example 6.

¹H NMR (DMSO-d₆) δ 7.74 (1H, s), 7.61-7.62 (1H, m), 7.57-7.56 (2H, m), 7.53-7.51 (2H, m), 6.78 (2H, brs), 5.41 (2H, t, J=5.7 Hz), 4.56 (1H, t, J=6.6 Hz), 4.14 (2H, t, J=6.6 Hz), 4.02 (3H, s), 3.76 (2H, t, J=6.6 Hz), 2.74 (2H, dt, J=5.8, 6.6 Hz), 1.67-1.63 (4H, m), 1.40-1.36 (2H, m), 1.31-1.27 (2H, m), 0.91 (3H, t, J=7.4 Hz).

REFERENCE EXAMPLE 24 Synthesis of 2-butoxy-8-methoxy-9-[4-(3-chloromethylbenzenesulfonamide)butyl]adenine

The titled compound was obtained by the same method as Reference Example 7.

¹H NMR (DMSO-d₆) δ 10.36 (1H, br), 7.84 (1H, dd, J=1.4, 1.7 Hz), 7.67-7.65 (2H, m), 7.57 (1H, t, J=7.9 Hz), 7.01 (2H, br), 4.86 (2H, s), 4.21 (2H, t, J=6.6 Hz), 3.62 (2H, t, J=6.6 Hz), 2.78 (2H, dt, J=5.8, 6.6 Hz), 1.65-1.61 (4H, m), 1.41-1.36 (2H, m), 1.35-1.28 (2H, m), 0.91 (3H, t, J=7.4 Hz).

REFERENCE EXAMPLE 25 Synthesis of 2-butoxy-8-methoxy-9-[4-(3-cyanomethylbenzenesulfonamide)butyl]adenine

The titled compound was obtained by the same method as Reference Example 8.

¹H NMR (DMSO-d₆) δ 9.83 (1H, s), 7.77 (1H, s), 7.72-7.70 (2H, m), 7.59-7.57 (2H, m), 6.40 (2H, br), 4.18 (2H, s), 4.12 (2H, t, J=6.6 Hz), 3.60 (2H, t, J=6.6 Hz), 2.76 (2H, dt, J=5.8, 6.6 Hz), 1.66-1.61 (4H, m), 1.38-1.30 (4H, m), 0.91 (3H, t, J=7.4 Hz).

REFERENCE EXAMPLE 26 Synthesis of 2-butoxy-8-methoxy-9-[4-(3-methoxycarbonylphenylaminocarbonylamino)butyl]adenine

To a solution of 2-butoxy-8-methoxy-9-(4-aminobutyl)adenine solution (1143 mg, 3.71 mmol) obtained in Reference Example 20 in THF (37 ml) was added 3-methoxycarbonylphenyl isocyanate (689 mg, 3.9 mmol) under ice-cooling and the mixture was stirred for 5 minutes. The precipitated solid was collected by filtration to give 1550 mg (2.4 mmol) of the titled compound as a white solid. Yield: 86%.

¹H NMR (DMSO-d₆) δ 8.67 (1H, s), 8.10 (1H, dd, J=1.5, 2.2 Hz), 7.57 (1H, ddd, J=1.0, 2.2, 8.2 Hz), 7.48 (1H, ddd, J=1.0, 1.5, 7.6 Hz), 7.34 (1H, dd, J=7.6, 8.2 Hz), 7.68 (2H, brs), 6.17 (1H, t, J=5.7 Hz), 4.15 (2H, t, J=6.6 Hz), 4.05 (3H, s), 3.86 (2H, t, J=6.8 Hz), 3.82 (3H, s), 3.10 (2H, dt, J=5.7, 6.6 Hz), 1.73-1.66 (2H, m), 1.66-1.59 (2H, m), 1.42-1.35 (4H, m), 0.88 (3H, t, J=7.4 Hz).

REFERENCE EXAMPLE 27 Synthesis of 2-butoxy-8-methoxy-9-[4-(3-hydroxymethylphenylaminocarbonylamino)butyl]adenine

The titled compound was obtained by the same method as Reference Example 6.

¹H NMR (DMSO-d₆) δ 8.36 (1H, s), 7.32 (1H, s), 7.25 (1H, d, J=8.0 Hz), 7.13 (1H, dd, J=7.6, 8.0 Hz), 6.81 (1H, d, J=7.6 Hz), 6.78 (2H, brs), 6.08 (1H, t, J=5.7 Hz), 5.11 (1H, t, J=5.7 Hz), 4.41 (2H, d, J=5.7 Hz), 4.17 (2H, t, J=6.6 Hz), 4.05 (3H, s), 3.84 (2H, t, J=6.8 Hz), 3.09 (2H, dt, J=5.7, 6.6 Hz), 1.72-1.66 (2H, m), 1.67-1.60 (2H, m), 1.41-1.35 (4H, m), 0.91 (3H, t, J=7.4 Hz).

An Example of a Pharmaceutical Preparation

There was prepared an aerosol containing per 1 g of the aerosol, the compound of Example 9 (0.641 mg, 0.06%), ethanol (26.816 mg, 2.68%) and 1,1,1,2-tetrafluoroethane (972.543 mg, 97.25%).

Industrial Applicability

By the present invention, it has become possible to provide an 8-oxoadenine compound effective as a therapeutic or prophylactic agent for diseases including allergic diseases such as asthma and atopic dermatitis, viral diseases such as herpes and cancers. Further, in a case where the compound of the present invention is externally applied (topical administration) in a form of spray, etc., systemic adverse effects caused by an interferon inducing activity is suppressed and the strong effect is exhibited in the applied region. 

The invention claimed is:
 1. A method for treating asthma or allergic rhinitis comprising: administering to a patient a therapeutic effective amount of 8-oxoadenine compound shown by formula (1):

wherein ring A represents a 6-10 membered aromatic carbocyclic ring or a 5-10 membered heteroaromatic ring; R represents a halogen atom, an alkyl group, a hydroxyalkyl group, a haloalkyl group, an alkoxy group, a hydroxyalkoxy group, a haloalkoxy group, amino group, an alkylamino group, a dialkylamino group, or a 4-7 membered cyclic group containing in the ring 1-2 hetero atoms selected from 1-2 nitrogen atoms and optionally 0-1 oxygen atom or 0-1 sulfur atom; n represents an integer of 0-2, and when n is 2, the Rs may be the same or different; Z¹ represents a substituted or unsubstituted alkylene group or a substituted or unsubstituted cycloalkylene group; X² represents oxygen atom, sulfur atom, SO₂, NR⁵, CO, CONR⁵, NR⁵CO, SO₂NR⁵, NR⁵SO₂, NR⁵CONR⁶ or NR⁵CSNR⁶ (in which R⁵ and R⁶ are each independently hydrogen atom, a substituted or unsubstituted alkyl group, or a substituted or unsubstituted cycloalkyl group); Y¹, Y² and Y³ represent each independently a single bond or an alkylene group; X¹ represents oxygen atom, sulfur atom, SO₂, NR⁴ (wherein R⁴ is hydrogen atom or an alkyl group) or a single bond; R² represents hydrogen atom, a substituted or unsubstituted alkyl group, a substituted or unsubstituted alkenyl group, a substituted or unsubstituted alkynyl group or a substituted or unsubstituted cycloalkyl group; and R¹ represents hydrogen atom, hydroxy group, an alkoxy group, an alkoxycarbonyl group, a haloalkyl group, a haloalkoxy group, a substituted or unsubstituted aryl group, a substituted or unsubstituted heteroaryl group or a substituted or unsubstituted cycloalkyl group, or its pharmaceutically acceptable salt.
 2. A method for modulating immune response comprising administering to a patient a therapeutically effective amount of 8-oxoadenine compound shown by formula (1):

wherein ring A represents a 6-10 membered aromatic carbocyclic ring or a 5-10 membered heteroaromatic ring; R represents a halogen atom, an alkyl group, a hydroxyalkyl group, a haloalkyl group, an alkoxy group, a hydroxyalkoxy group, a haloalkoxy group, amino group, an alkylamino group, a dialkylamino group, or a 4-7 membered cyclic group containing in the ring 1-2 hetero atoms selected from 1-2 nitrogen atoms and optionally 0-1 oxygen atom or 0-1 sulfur atom; n represents an integer of 0-2, and when n is 2, the Rs may be the same or different; Z¹ represents a substituted or unsubstituted alkylene group or a substituted or unsubstituted cycloalkylene group; X² represents oxygen atom, sulfur atom, SO₂, NR⁵, CO, CONR⁵, NR⁵CO, SO₂NR⁵, NR⁵SO₂, NR⁵CONR⁶ or NR⁵CSNR⁶ (in which R⁵ and R⁶ are each independently hydrogen atom, a substituted or unsubstituted alkyl group, or a substituted or unsubstituted cycloalkyl group); Y¹, Y² and Y³ represent each independently a single bond or an alkylene group; X¹ represents oxygen atom, sulfur atom, SO₂, NR⁴ (wherein R⁴ is hydrogen atom or an alkyl group) or a single bond; R² represents hydrogen atom, a substituted or unsubstituted alkyl group, a substituted or unsubstituted alkenyl group, a substituted or unsubstituted alkynyl group or a substituted or unsubstituted cycloalkyl group; and R¹ represents hydrogen atom, hydroxy group, an alkoxy group, an alkoxycarbonyl group, a haloalkyl group, a haloalkoxy group, a substituted or unsubstituted aryl group, a substituted or unsubstituted heteroaryl group or a substituted or unsubstituted cycloalkyl group, or its pharmaceutically acceptable salt.
 3. The method according to claim 1, wherein: ring A represents a 6-10 membered aromatic carbocyclic ring, or a 5-10 membered heteroaromatic ring containing 1-4 hetero atoms selected from 0-4 nitrogen atoms, 0-2 oxygen atoms, and 0-2 sulfur atoms; R represents a halogen atom, an alkyl group of 1-6 carbons, a hydroxyalkyl group of 1-6 carbons, a haloalkyl group of 1-6 carbons, an alkoxy group of 1-6 carbons, a hydroxyalkoxy group of 1-6 carbons, a haloalkoxy group of 1-6 carbons, amino group, an alkylamino group of 1-6 carbons, a dia kylamino group in which each alkyl moiety has 1-6 carbons, or a 4-7 membered cyclic group containing in the ring 1-2 hetero atoms selected from 1-2 nitrogen atoms and optionally 0-1 oxygen atom or 0-1 sulfur atom; Z¹ represents an alkylene group of 1-6 carbons or a cycloalkylene group of 3-8 carbons, which is optionally substituted by hydroxy group; X² represents oxygen atom, sulfur atom, SO₂, NR⁵, CO, CONR⁵, NR⁵CO, SO₂NR⁵, NR⁵SO₂, NR⁵CONR⁶ or NR⁵CSNR⁶ (in which R⁵ and R⁶ are each independently hydrogen atom, a substituted or unsubstituted alkyl group of 1-6 carbons, or a substituted or unsubstituted cycloalkyl group of 3-8 carbons, wherein the substituents of the alkyl group or cycloalkyl group are selected from a halogen atom, hydroxy group, an alkoxy group of 1-6 carbons, carboxy group, an alkoxycarbonyl group of 2-5 carbons, carbamoyl group, amino group, an alkylamino group of 1-6 carbons, an dialkylamino group in which each alkyl moiety has 1-6 carbons, a cyclic group, and tetrazolyl group which may be substituted by an alkyl group of 1-6 carbons); Y¹, Y² and Y³ represent each independently a single bond or an alkylene group of 1-6 carbons; R² represents a substituted or unsubstituted alkyl group of 1-6 carbons, a substituted or unsubstituted alkenyl group of 2-6 carbons, a substituted or unsubstituted alkynyl group of 2-6 carbons, or a substituted or unsubstituted cycloalkyl group of 3-8 carbons (wherein the substituent in the alkyl group, alkenyl group and alkynyl group is selected from a halogen atom, hydroxy group, an alkoxy group of 1-6 carbons, an acyloxy group of 2-10 carbons selected from the group consisting of a substituted or unsubstituted alkylcarbonyloxy group of 2-5 carbons, a substituted or unsubstituted alkenylcarbonyloxy group of 2-5 carbons, a substituted or unsubstituted alkynylcarbonyloxy group of 2-5 carbons, a substituted or unsubstituted arylcarbonyloxy group and a substituted or unsubstituted heteroarylcarbonyloxy group, amino group, an alkylamino group of 1-6 carbons, a dialklylamino group in which the each alkyl moiety has 1-6 carbons, and a cyclic group); and R¹ represents hydrogen atom, hydroxy group, an alkoxy group of 1-6 carbons, an alkoxycarbonyl group of 2-5 carbons, a haloalkyl group of 1-6 carbons, a haloalkoxy group of 1-6 carbons, a substituted or unsubstituted aryl group of 6-10 carbons, a substituted or unsubstituted 5-10 membered heteroaryl group containing 1-4 hetero atoms selected from 0-4 nitrogen atoms, 0-2 oxygen atoms and 0-2 sulfur atoms, or a substituted or unsubstituted cycloalkyl group of 3-8 carbons; and the said substituent in the aryl group, the heteroaryl group, and the cycloalkyl group is selected from a halogen atom, hydroxy group, an alkyl group of 1-6 carbons, a haloalkyl group of 1-6 carbons, an alkoxy group of 1-6 carbons, a haloalkoxy group of 1-6 carbons, an alkylcarbonyl group of 2-5 carbons, amino group, an alkylamino group of 1-6 carbons and a dialkylamino group (wherein the each alkyl group has 1-6 carbons), and the said cyclic group represents a 4-7 membered saturated cyclic group containing in the ring 1-2 hetero atoms selected from 1-2 nitrogen atoms and optionally 0-1 oxygen atom or 0-1 sulfur atom, which may be substituted with a halogen atom, hydroxy group, oxo group, an alkyl group of 1-6 carbons, an alkoxy group of 1-6 carbons, an alkylcarbonyl group of 2-5 carbons, or an alkoxycarbonyl group of 2-5 carbons, or its pharmaceutically acceptable salt.
 4. The method according to claim 1, wherein X² is oxygen atom, sulfur atom, NR⁵, SO₂, NR⁵SO₂, or NR⁵CONR⁶.
 5. The method according to claim 1, wherein Y³ is a single bond, methylene, or ethylene.
 6. The method according to claim 1, wherein Z¹ is a straight chained alkylene group of 1-6 carbons which may be substituted with hydroxy group.
 7. The method according to claim 1, wherein X¹ is oxygen atom or sulfur atom.
 8. The method according to claim 1, wherein Y¹ is a single bond or an alkylene group of 1-6 carbons.
 9. The method according to claim 1, wherein R¹ is hydrogen atom, an alkoxycarbonyl group, hydroxy group, or an alkoxy group.
 10. The method according to claim 1, wherein in the formula (1), a group shown by the formula (2):

(wherein ring A, R, n, Y³ and R² have the same meaning as in claim 1) is a group shown by the formula (3) or the formula (4):

(wherein R, n and R² have the same meaning as in claim 1, and R³ is hydrogen atom or an alkyl group).
 11. The method according to claim 1, wherein R² is methyl group or an alkyl group of 2-6 carbons substituted by a dialkylamino group or a cyclic group.
 12. The method according to claim 10, wherein R³ is hydrogen atom.
 13. The method according to claim 1, wherein the compound shown by formula (1) is chosen from: Methyl (3-{[[4-(6-amino-2-butoxy-8-oxo-7,8-dihydro-9H-purin-9-yl)butyl](3-morpholin-4-ylpropyl)amino]methyl}phenyl)acetate, its pharmaceutically acceptable salts, Methyl [3-({[4-(6-amino-2-butoxy-8-oxo-7,8-dihydro-9H-purin-9-yl)butyl][3-(dimethylamino)-2,2-dimethylpropyl]amino}methyl)phenyl]acetate, its pharmaceutically acceptable salts, Methyl (3-{[[4-(6-amino-2-butoxy-8-oxo-7,8-dihydro-9H-purin-9-yl)butyl](2-morpholin-4-ylethyl)amino]methyl}phenyl)acetate, its pharmaceutically acceptable salts, and Methyl (3-{[[3-(6-amino-2-butoxy-8-oxo-7,8-dihydro-9H-purin-9-yl)propyl](3-morpholin-4-ylpropyl)amino]methyl}phenyl)acetate, and its pharmaceutically acceptable salts.
 14. The method according to claim 1, wherein the compound shown by formula (1) is Methyl (3-{[[3-(6-amino-2-butoxy-8-oxo-7,8-dihydro-9H-purin-9-yl)propyl](3-morpholin-4-ylpropyl)amino]methyl}phenyl)acetate or its pharmaceutically acceptable salts.
 15. The method according to claim 2, wherein: ring A represents a 6-10 membered aromatic carbocyclic ring, or a 5-10 membered heteroaromatic ring containing 1-4 hetero atoms selected from 0-4 nitrogen atoms, 0-2 oxygen atoms, and 0-2 sulfur atoms; R represents a halogen atom, an alkyl group of 1-6 carbons, a hydroxyalkyl group of 1-6 carbons, a haloalkyl group of 1-6 carbons, an alkoxy group of 1-6 carbons, a hydroxyalkoxy group of 1-6 carbons, a haloalkoxy group of 1-6 carbons, amino group, an alkylamino group of 1-6 carbons, a dialkylamino group in which each alkyl moiety has 1-6 carbons, or a 4-7 membered cyclic group containing in the ring 1-2 hetero atoms selected from 1-2 nitrogen atoms and optionally 0-1 oxygen atom or 0-1 sulfur atom; Z¹ represents an alkylene group of 1-6 carbons or a cycloalkylene group of 3-8 carbons, which is optionally substituted by hydroxy group; X² represents oxygen atom, sulfur atom, SO₂, NR⁵, CO, CONR⁵, NR⁵CO, SO₂NR⁵, NR⁵SO₂, NR⁵CONR⁶ or NR⁵CSNR⁶ (in which R⁵ and R⁶ are each independently hydrogen atom, a substituted or unsubstituted alkyl group of 1-6 carbons, or a substituted or unsubstituted cycloalkyl group of 3-8 carbons, wherein the substituents of the alkyl group or cycloalkyl group are selected from a halogen atom, hydroxy group, an alkoxy group of 1-6 carbons, carboxy group, an alkoxycarbonyl group of 2-5 carbons, carbamoyl group, amino group, an alkylamino group of 1-6 carbons, an dialkylamino group in which each alkyl moiety has 1-6 carbons, a cyclic group, and tetrazolyl group which may be substituted by an alkyl group of 1-6 carbons); Y¹, Y² and Y³ represent each independently a single bond or an alkylene group of 1-6 carbons; R² represents a substituted or unsubstituted alkyl group of 1-6 carbons, a substituted or unsubstituted alkenyl group of 2-6 carbons, a substituted or unsubstituted alkynyl group of 2-6 carbons, or a substituted or unsubstituted cycloalkyl group of 3-8 carbons (wherein the substituent in the alkyl group, alkenyl group and alkynyl group is selected from a halogen atom, hydroxy group, an alkoxy group of 1-6 carbons, an acyloxy group of 2-10 carbons selected from the group consisting of a substituted or unsubstituted alkylcarbonyloxy group of 2-5 carbons, a substituted or unsubstituted alkenylcarbonyloxy group of 2-5 carbons, a substituted or unsubstituted alkynylcarbonyloxy group of 2-5 carbons, a substituted or unsubstituted arylcarbonyloxy group and a substituted or unsubstituted heteroarylcarbonyloxy group, amino group, an alkylamino group of 1-6 carbons, a dialklylamino group in which the each alkyl moiety has 1-6 carbons, and a cyclic group); and R¹ represents hydrogen atom, hydroxy group, an alkoxy group of 1-6 carbons, an alkoxycarbonyl group of 2-5 carbons, a haloalkyl group of 1-6 carbons, a haloalkoxy group of 1-6 carbons, a substituted or unsubstituted aryl group of 6-10 carbons, a substituted or unsubstituted 5-10 membered heteroaryl group containing 1-4 hetero atoms selected from 0-4 nitrogen atoms, 0-2 oxygen atoms and 0-2 sulfur atoms, or a substituted or unsubstituted cycloalkyl group of 3-8 carbons; and the said substituent in the aryl group, the heteroaryl group, and the cycloalkyl group is selected from a halogen atom, hydroxy group, an alkyl group of 1-6 carbons, a haloalkyl group of 1-6 carbons, an alkoxy group of 1-6 carbons, a haloalkoxy group of 1-6 carbons, an alkylcarbonyl group of 2-5 carbons, amino group, an alkylamino group of 1-6 carbons and a dialkylamino group (wherein the each alkyl group has 1-6 carbons), and the said cyclic group represents a 4-7 membered saturated cyclic group containing in the ring 1-2 hetero atoms selected from 1-2 nitrogen atoms and optionally 0-1 oxygen atom or 0-1 sulfur atom, which may be substituted with a halogen atom, hydroxy group, oxo group, an alkyl group of 1-6 carbons, an alkoxy group of 1-6 carbons, an alkylcarbonyl group of 2-5 carbons, or an alkoxycarbonyl group of 2-5 carbons, or its pharmaceutically acceptable salt.
 16. The method according to claim 2, wherein X² is oxygen atom, sulfur atom, NR⁵, SO₂, NR⁵SO₂, or NR⁵CONR⁶.
 17. The method according to claim 2, wherein Y³ is a single bond, methylene, or ethylene.
 18. The method according to claim 2, wherein Z¹ is a straight chained alkylene group of 1-6 carbons which may be substituted with hydroxy group.
 19. The method according to claim 2, wherein X¹ is oxygen atom or sulfur atom.
 20. The method according to claim 2, wherein Y¹ is a single bond or an alkylene group of 1-6 carbons.
 21. The method according to claim 2, wherein R¹ is hydrogen atom, an alkoxycarbonyl group, hydroxy group, or an alkoxy group.
 22. The method according to claim 2, wherein in the formula (1), a group shown by the formula (2):

(wherein ring A, R, n, Y³ and R² have the same meaning as in claim 2) is a group shown by the formula (3) or the formula (4):

(wherein R, n and R² have the same meaning as in claim 2, and R³ is hydrogen atom or an alkyl group).
 23. The method according to claim 2, wherein R² is methyl group or an alkyl group of 2-6 carbons substituted by a dialkylamino group or a cyclic group.
 24. The method according to claim 22, wherein R³ is hydrogen atom.
 25. The method according to claim 2, wherein the compound shown by formula (1) is chosen from: Methyl (3-{[[4-(6-amino-2-butoxy-8-oxo-7,8-dihydro-9H-purin-9-yl)butyl]3-morpholin-4-ylpropyl)amino]methyl}phenyl)acetate, its pharmaceutically acceptable salts, Methyl [3-({[4-(6-amino-2-butoxy-8-oxo-7,8-dihydro-9H-purin-9-yl)butyl][3-(dimethylamino)-2,2-dimethylpropyl]amino}methyl)phenyl]acetate, its pharmaceutically acceptable salts, Methyl (3-{[[4-(6-amino-2-butoxy-8-oxo-7,8-dihydro-9H-purin-9-yl)butyl](2-morpholin-4-ylethyl)amino]methyl}phenyl)acetate, its pharmaceutically acceptable salts, and Methyl (3-{[[3-(6-amino-2-butoxy-8-oxo-7,8-dihydro-9H-purin-9-yl)propyl](3-morpholin-4-ylpropyl)amino]methyl}phenyl)acetate, and its pharmaceutically acceptable salts.
 26. The method according to claim 2, wherein the compound shown by formula (1) is Methyl (3-{[[3-(6-amino-2-butoxy-8-oxo-7,8-dihydro-9H-purin-9-yl)propyl](3-morpholin-4-ylpropyl)amino]methyl}phenyl)acetate or its pharmaceutically acceptable salt. 